INFO: task hung in blkdev_reread_part
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syzbot
Apr 10, 2019, 12:04:10 PM4/10/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: c556d1ff Merge 4.14.78 into android-4.14
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=16285189400000
kernel config: https://syzkaller.appspot.com/x/.config?x=71219c5dc171efec
dashboard link: https://syzkaller.appspot.com/bug?extid=b779ba2bf386464eebd0
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117b55b1400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12652365400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b779ba...@syzkaller.appspotmail.com
INFO: task syz-executor282:1957 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28376 1957 1896 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1958 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D26552 1958 1900 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
loop_control_ioctl+0x180/0x310 drivers/block/loop.c:1965
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441439
RSP: 002b:00007fff99d5a188 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441439
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000c R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000000ccb0c
R13: 0000000000402300 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor282:1959 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28472 1959 1899 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1960 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28296 1960 1901 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1961 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28664 1961 1897 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1963 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D29016 1963 1898 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x401340
RSP: 002b:00007fff99d59f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000401340
RDX: 00007fff99d5a0da RSI: 0000000000000002 RDI: 00007fff99d5a0d0
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task blkid:1965 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27528 1965 287 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_release+0x1a/0x190 drivers/block/loop.c:1635
__blkdev_put+0x526/0x6e0 fs/block_dev.c:1783
blkdev_close+0x86/0xb0 fs/block_dev.c:1855
__fput+0x25e/0x6f0 fs/file_table.c:210
task_work_run+0x116/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x12e/0x150 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f09102fd2b0
RSP: 002b:00007fffe3c116e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f09102fd2b0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000b48030
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005
INFO: task blkid:1966 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29000 1966 1914 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x267/0xe50 fs/block_dev.c:1467
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f2d2adbb120
RSP: 002b:00007ffeb6833868 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2d2adbb120
RDX: 00007ffeb6835f41 RSI: 0000000000000000 RDI: 00007ffeb6835f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001912030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:1971 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29000 1971 1919 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x8e2/0xe50 fs/block_dev.c:1529
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f208e524120
RSP: 002b:00007fffad751538 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f208e524120
RDX: 00007fffad751f41 RSI: 0000000000000000 RDI: 00007fffad751f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000009b7030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:1972 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27816 1972 286 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x8e2/0xe50 fs/block_dev.c:1529
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f1f4ea3c120
RSP: 002b:00007fff5d24c978 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f4ea3c120
RDX: 00007fff5d24df41 RSI: 0000000000000000 RDI: 00007fff5d24df41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001ff9030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<ffffffffb9a02247>]
debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
2 locks held by getty/1754:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffba52f6c0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffba52ac3f>]
n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor282/1957:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1958:
#0: (loop_index_mutex){+.+.}, at: [<ffffffffba5e1bd1>]
loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1951
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<ffffffffba5e1ce0>]
loop_control_ioctl+0x180/0x310 drivers/block/loop.c:1965
2 locks held by syz-executor282/1959:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1960:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1961:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
1 lock held by syz-executor282/1963:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
2 locks held by blkid/1965:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e190a1>]
__blkdev_put+0xb1/0x6e0 fs/block_dev.c:1770
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5e06fa>]
lo_release+0x1a/0x190 drivers/block/loop.c:1635
2 locks held by blkid/1966:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1971:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1972:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1973:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1974:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.78+ #22
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x574/0xa70 kernel/hung_task.c:252
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffffbb056702
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: c556d1ff Merge 4.14.78 into android-4.14
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=16285189400000
kernel config: https://syzkaller.appspot.com/x/.config?x=71219c5dc171efec
dashboard link: https://syzkaller.appspot.com/bug?extid=b779ba2bf386464eebd0
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117b55b1400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12652365400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b779ba...@syzkaller.appspotmail.com
INFO: task syz-executor282:1957 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28376 1957 1896 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1958 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D26552 1958 1900 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
loop_control_ioctl+0x180/0x310 drivers/block/loop.c:1965
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441439
RSP: 002b:00007fff99d5a188 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441439
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000c R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000000ccb0c
R13: 0000000000402300 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor282:1959 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28472 1959 1899 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1960 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28296 1960 1901 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1961 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D28664 1961 1897 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:614
loop_set_status+0xa84/0xf40 drivers/block/loop.c:1169
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441347
RSP: 002b:00007fff99d59f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000441347
RDX: 00007fff99d59fe0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task syz-executor282:1963 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor282 D29016 1963 1898 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x401340
RSP: 002b:00007fff99d59f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000401340
RDX: 00007fff99d5a0da RSI: 0000000000000002 RDI: 00007fff99d5a0d0
RBP: 00000000200013c8 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000000
INFO: task blkid:1965 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27528 1965 287 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_release+0x1a/0x190 drivers/block/loop.c:1635
__blkdev_put+0x526/0x6e0 fs/block_dev.c:1783
blkdev_close+0x86/0xb0 fs/block_dev.c:1855
__fput+0x25e/0x6f0 fs/file_table.c:210
task_work_run+0x116/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x12e/0x150 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f09102fd2b0
RSP: 002b:00007fffe3c116e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f09102fd2b0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000b48030
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005
INFO: task blkid:1966 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29000 1966 1914 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x267/0xe50 fs/block_dev.c:1467
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f2d2adbb120
RSP: 002b:00007ffeb6833868 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2d2adbb120
RDX: 00007ffeb6835f41 RSI: 0000000000000000 RDI: 00007ffeb6835f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001912030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:1971 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29000 1971 1919 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x8e2/0xe50 fs/block_dev.c:1529
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f208e524120
RSP: 002b:00007fffad751538 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f208e524120
RDX: 00007fffad751f41 RSI: 0000000000000000 RDI: 00007fffad751f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000009b7030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:1972 blocked for more than 140 seconds.
Not tainted 4.14.78+ #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27816 1972 286 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_open+0x17/0xa0 drivers/block/loop.c:1592
__blkdev_get+0x8e2/0xe50 fs/block_dev.c:1529
blkdev_get+0x97/0x8c0 fs/block_dev.c:1604
blkdev_open+0x1bd/0x240 fs/block_dev.c:1762
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f1f4ea3c120
RSP: 002b:00007fff5d24c978 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f4ea3c120
RDX: 00007fff5d24df41 RSI: 0000000000000000 RDI: 00007fff5d24df41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001ff9030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<ffffffffb9a02247>]
debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
2 locks held by getty/1754:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffba52f6c0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffba52ac3f>]
n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor282/1957:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1958:
#0: (loop_index_mutex){+.+.}, at: [<ffffffffba5e1bd1>]
loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1951
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<ffffffffba5e1ce0>]
loop_control_ioctl+0x180/0x310 drivers/block/loop.c:1965
2 locks held by syz-executor282/1959:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1960:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
2 locks held by syz-executor282/1961:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffba5dee65>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffba310628>]
blkdev_reread_part+0x18/0x30 block/ioctl.c:192
1 lock held by syz-executor282/1963:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
2 locks held by blkid/1965:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e190a1>]
__blkdev_put+0xb1/0x6e0 fs/block_dev.c:1770
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5e06fa>]
lo_release+0x1a/0x190 drivers/block/loop.c:1635
2 locks held by blkid/1966:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1971:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1972:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1973:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
2 locks held by blkid/1974:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffb9e197c3>]
__blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffba5da697>] lo_open+0x17/0xa0
drivers/block/loop.c:1592
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.78+ #22
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x574/0xa70 kernel/hung_task.c:252
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffffbb056702
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Apr 13, 2019, 8:02:16 PM4/13/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
syzbot found the following crash on:
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=109f188f400000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=943826a36b085370db5f
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=142bff88c00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
INFO: task syz-executor.1:3146 blocked for more than 140 seconds.
Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D ffff8801d5e8f818 28384 3146 2210 0x00000004
ffff8801d5e8f818 ffff8801d671c740 3ad5bc2a720dfb73 ffff8801d671c740
0000000000000001 ffff8801d671d000 ffff8801db61f180 ffff8801db61f1a8
ffff8801db61e898 ffffffff82e151c0 ffff8801d671c740 ffffed003abd1001
Call Trace:
[<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
[<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3388
[<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80
kernel/locking/mutex.c:621
[<ffffffff81a7920f>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
[<ffffffff81d3ed4c>] loop_reread_partitions+0x7c/0x90
drivers/block/loop.c:649
[<ffffffff81d3f962>] loop_set_status+0xc02/0x1260 drivers/block/loop.c:1208
[<ffffffff81d404b6>] loop_set_status64+0xc6/0x120 drivers/block/loop.c:1317
[<ffffffff81d469a8>] lo_ioctl+0x4b8/0x1a70 drivers/block/loop.c:1442
[<ffffffff81a7ae89>] __blkdev_driver_ioctl block/ioctl.c:288 [inline]
[<ffffffff81a7ae89>] blkdev_ioctl+0xed9/0x1940 block/ioctl.c:584
[<ffffffff8155036e>] block_ioctl+0xde/0x120 fs/block_dev.c:1625
[<ffffffff814d23f7>] vfs_ioctl fs/ioctl.c:43 [inline]
[<ffffffff814d23f7>] file_ioctl fs/ioctl.c:470 [inline]
[<ffffffff814d23f7>] do_vfs_ioctl+0x6e7/0xfa0 fs/ioctl.c:605
[<ffffffff814d2d3f>] SYSC_ioctl fs/ioctl.c:622 [inline]
[<ffffffff814d2d3f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
2 locks held by syz-executor.1/3146:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<ffffffff81d46575>]
lo_ioctl+0x85/0x1a70 drivers/block/loop.c:1416
#1: (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81a7920f>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.174+ #4
task: ffffffff82e151c0 task.stack: ffffffff82e00000
RIP: 0010:[<ffffffff810a1dc2>] [<ffffffff810a1dc2>]
native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:53
RSP: 0018:ffffffff82e07db0 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffffff8319bf68 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff82e15a84
RBP: ffffffff82e07de0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff82e08000 R14: dffffc0000000000 R15: ffffffff82e00000
FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007831ec CR3: 00000000b8c53000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff81020b16 ffffffff82e00000 0000000000000000 ffffffff82e08000
dffffc0000000000 ffffffff82e00000 ffffffff82e07df0 ffffffff81022d50
ffffffff82e07e08 ffffffff811eb4c8 0000000000000000 ffffffff82e07ed0
Call Trace:
[<ffffffff81022d50>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:423
[<ffffffff811eb4c8>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
[<ffffffff811ebca1>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
[<ffffffff811ebca1>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
[<ffffffff811ebca1>] cpu_startup_entry+0x6d1/0x810 kernel/sched/idle.c:301
[<ffffffff827055f9>] rest_init+0x190/0x199 init/main.c:410
[<ffffffff831d58a0>] start_kernel+0x64a/0x67e init/main.c:682
[<ffffffff831d430a>] x86_64_start_reservations+0x29/0x2b
arch/x86/kernel/head64.c:196
[<ffffffff831d4443>] x86_64_start_kernel+0x137/0x15a
arch/x86/kernel/head64.c:185
Code: 2e 0f 1f 84 00 00 00 00 00 fa c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00
00 00 fb c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 fb f4 <c3> 0f 1f 00
66 2e 0f 1f 84 00 00 00 00 00 f4 c3 0f 1f 40 00 66
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6c2f80 task.stack: ffff8800001e8000
RIP: 0010:[<ffffffff8109b617>] [<ffffffff8109b617>] _flat_send_IPI_mask
arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>] [<ffffffff8109b617>]
flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001efc88 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001efcb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007831ec CR3: 00000000b5072000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
000000000001b6c0 0000000000000008 ffff8800001efcd8 ffffffff81092bee
0000000000000008 ffffffff82924260 ffff8800001efd30 ffffffff81ab8252
Call Trace:
[<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80
arch/x86/kernel/apic/hw_nmi.c:33
[<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae
lib/nmi_backtrace.c:85
[<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:38
[<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44
[inline]
[<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff813b4762>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
[<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89
fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00
02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1
syzbot
Apr 14, 2019, 5:28:24 AM4/14/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: fc67a895 ANDROID: Makefile: Add '-fsplit-lto-unit' to cfi-..
syzbot found the following crash on:
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=12eaeebf200000
kernel config: https://syzkaller.appspot.com/x/.config?x=416e7ad1468db859
dashboard link: https://syzkaller.appspot.com/bug?extid=a3fa1971367de4b548ca
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
INFO: task syz-executor.1:2126 blocked for more than 140 seconds.
Not tainted 4.9.168+ #40
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D24744 2126 1 0x00000004
ffff8801cf248000 ffff8801d3a7b180 ffff8801db621000 ffff8801d3028000
ffff8801db621018 ffff8801ae937988 ffffffff8280028e ffffffff8280fe2a
0000000000000000 00ffffff84275048 ffff8801db6218f0 1ffff10035d26f20
Call Trace:
[<00000000029b91a6>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000fc76132f>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3579
[<000000005017f734>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<000000005017f734>] mutex_lock_nested+0x38d/0x920
kernel/locking/mutex.c:621
[<000000002fa38bdb>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
[<00000000c7281a0c>] loop_reread_partitions+0x7c/0x90
drivers/block/loop.c:638
[<00000000fe0f24d3>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1082
[<00000000136de19a>] lo_ioctl+0x7b6/0x1a10 drivers/block/loop.c:1415
[<000000001c93bf57>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
[<000000001c93bf57>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590
[<00000000174b91a3>] block_ioctl+0xde/0x120 fs/block_dev.c:1696
[<000000006352b66a>] vfs_ioctl fs/ioctl.c:43 [inline]
[<000000006352b66a>] file_ioctl fs/ioctl.c:493 [inline]
[<000000006352b66a>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
[<00000000b83d1c7a>] SYSC_ioctl fs/ioctl.c:694 [inline]
[<00000000b83d1c7a>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
[<00000000f4e1cf63>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
[<00000000c4a82496>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
#0: (rcu_read_lock){......}, at: [<00000000ef6c23af>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<00000000ef6c23af>]
watchdog+0x13c/0xae0 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<00000000644c2b21>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
1 lock held by rsyslogd/1907:
#0: (&f->f_pos_lock){+.+.+.}, at: [<00000000b67e3307>]
__fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2035:
#0: (&tty->ldisc_sem){++++++}, at: [<00000000cd19189f>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000d9b717f7>]
n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/2126:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000002cc0806b>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.+.}, at: [<000000002fa38bdb>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
2 locks held by syz-executor.0/2131:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000002534b6bb>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.2/2134:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000002534b6bb>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
3 locks held by syz-executor.3/2135:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<000000002d5e25b0>]
__blkdev_put+0xbb/0x840 fs/block_dev.c:1587
#1: (loop_index_mutex){+.+.+.}, at: [<000000000faf4e52>]
lo_release+0x1e/0x1b0 drivers/block/loop.c:1664
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000007b6b08c3>] __lo_release
drivers/block/loop.c:1642 [inline]
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000007b6b08c3>]
lo_release+0x84/0x1b0 drivers/block/loop.c:1665
2 locks held by syz-executor.5/2138:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000002534b6bb>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.4/2139:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000002534b6bb>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by blkid/3667:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
2 locks held by blkid/3668:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bfa319e9>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000002534b6bb>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
=============================================
NMI backtrace for cpu 0
ffff8801d98d7cc8 ffffffff81b4f5d1 0000000000000000 0000000000000000
0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
ffffffff81b5a86c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
[<00000000f9493075>] __dump_stack lib/dump_stack.c:15 [inline]
[<00000000f9493075>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<000000008164e2c0>] nmi_cpu_backtrace.cold+0x47/0x87
lib/nmi_backtrace.c:99
[<000000007e0047f4>] nmi_trigger_cpumask_backtrace+0x124/0x155
lib/nmi_backtrace.c:60
[<000000000ac6a1b1>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<00000000a40a5d52>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<00000000a40a5d52>] check_hung_task kernel/hung_task.c:125 [inline]
[<00000000a40a5d52>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<00000000a40a5d52>] watchdog+0x661/0xae0 kernel/hung_task.c:239
[<00000000ca8e74df>] kthread+0x278/0x310 kernel/kthread.c:211
[<0000000078f0dc79>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8280f302
syzbot
Apr 19, 2019, 6:08:08 PM4/19/19
to syzkaller-a...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 5d68df32 ANDROID: Makefile: Properly resolve 4.9.169 merge
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=15a6921d200000
kernel config: https://syzkaller.appspot.com/x/.config?x=3cfc99439c5f8298
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a3fa19...@syzkaller.appspotmail.com
audit: type=1400 audit(1555710266.854:5): avc: denied { associate } for
pid=2249 comm="syz-executor.1" name="syz1"
scontext=unconfined_u:object_r:unlabeled_t:s0
tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
INFO: task syz-executor.0:2247 blocked for more than 140 seconds.
Not tainted 4.9.169+ #43
ffff8801c95897c0 0000000000000000 ffff8801db721000 ffff8801da6f2f80
ffff8801db721018 ffff8801c9317988 ffffffff8280152e ffffffff828110ca
0000000000000000 00ffffff842c0848 ffff8801db7218f0 1ffff10039262f20
Call Trace:
[<00000000c5bea067>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000bfae124a>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3579
[<00000000dbc7492d>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<00000000dbc7492d>] mutex_lock_nested+0x38d/0x920
kernel/locking/mutex.c:621
[<000000008d107f62>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
[<00000000040a29b0>] loop_reread_partitions+0x7c/0x90
drivers/block/loop.c:638
[<000000008092aec3>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1082
[<00000000c873fed1>] lo_ioctl+0x7b6/0x1a10 drivers/block/loop.c:1415
[<00000000a0a36712>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
[<00000000a0a36712>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590
[<00000000af0ea2b4>] block_ioctl+0xde/0x120 fs/block_dev.c:1696
[<00000000daace02b>] vfs_ioctl fs/ioctl.c:43 [inline]
[<00000000daace02b>] file_ioctl fs/ioctl.c:493 [inline]
[<00000000daace02b>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
[<0000000091706496>] SYSC_ioctl fs/ioctl.c:694 [inline]
[<0000000091706496>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
[<000000005c34837e>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
[<0000000076ba8cec>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
2 locks held by khungtaskd/24:
#0: (rcu_read_lock){......}, at: [<00000000e806f38e>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<00000000e806f38e>]
watchdog+0x13c/0xae0 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<0000000066146396>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
2 locks held by getty/2040:
#0: (&tty->ldisc_sem){++++++}, at: [<00000000da415ca2>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<000000001386221c>]
n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/2247:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.+.}, at: [<000000008d107f62>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
1 lock held by syz-executor.1/2249:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
3 locks held by blkid/3319:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000030c975d3>]
__blkdev_put+0xbb/0x840 fs/block_dev.c:1587
#1: (loop_index_mutex){+.+.+.}, at: [<0000000082a73b83>]
lo_release+0x1e/0x1b0 drivers/block/loop.c:1664
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000b80a519f>] __lo_release
drivers/block/loop.c:1642 [inline]
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000b80a519f>]
lo_release+0x84/0x1b0 drivers/block/loop.c:1665
1 lock held by syz-executor.5/3320:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by blkid/3321:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.4/3322:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by blkid/3323:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.3/3324:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by syz-executor.2/3325:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by blkid/3326:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by blkid/3327:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.169+ #43
ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000000 0000000000000000
0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
ffffffff81b5aa8c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
[<00000000e26243c1>] __dump_stack lib/dump_stack.c:15 [inline]
[<00000000e26243c1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<000000005f8adca3>] nmi_cpu_backtrace.cold+0x47/0x87
lib/nmi_backtrace.c:99
[<00000000c77b010e>] nmi_trigger_cpumask_backtrace+0x124/0x155
lib/nmi_backtrace.c:60
[<000000001bcc9b0e>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<000000004bc002e2>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<000000004bc002e2>] check_hung_task kernel/hung_task.c:125 [inline]
[<000000004bc002e2>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<000000004bc002e2>] watchdog+0x661/0xae0 kernel/hung_task.c:239
[<0000000071fea858>] kthread+0x278/0x310 kernel/kthread.c:211
[<00000000d1fd0387>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
HEAD commit: 5d68df32 ANDROID: Makefile: Properly resolve 4.9.169 merge
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=15a6921d200000
kernel config: https://syzkaller.appspot.com/x/.config?x=3cfc99439c5f8298
dashboard link: https://syzkaller.appspot.com/bug?extid=a3fa1971367de4b548ca
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1292721d200000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a3fa19...@syzkaller.appspotmail.com
pid=2249 comm="syz-executor.1" name="syz1"
scontext=unconfined_u:object_r:unlabeled_t:s0
tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
INFO: task syz-executor.0:2247 blocked for more than 140 seconds.
Not tainted 4.9.169+ #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D25192 2247 1 0x00000004
ffff8801c95897c0 0000000000000000 ffff8801db721000 ffff8801da6f2f80
ffff8801db721018 ffff8801c9317988 ffffffff8280152e ffffffff828110ca
0000000000000000 00ffffff842c0848 ffff8801db7218f0 1ffff10039262f20
Call Trace:
[<00000000c5bea067>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000bfae124a>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3579
[<00000000dbc7492d>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<00000000dbc7492d>] mutex_lock_nested+0x38d/0x920
kernel/locking/mutex.c:621
[<000000008d107f62>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
[<00000000040a29b0>] loop_reread_partitions+0x7c/0x90
drivers/block/loop.c:638
[<000000008092aec3>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1082
[<00000000c873fed1>] lo_ioctl+0x7b6/0x1a10 drivers/block/loop.c:1415
[<00000000a0a36712>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
[<00000000a0a36712>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590
[<00000000af0ea2b4>] block_ioctl+0xde/0x120 fs/block_dev.c:1696
[<00000000daace02b>] vfs_ioctl fs/ioctl.c:43 [inline]
[<00000000daace02b>] file_ioctl fs/ioctl.c:493 [inline]
[<00000000daace02b>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
[<0000000091706496>] SYSC_ioctl fs/ioctl.c:694 [inline]
[<0000000091706496>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
[<000000005c34837e>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
[<0000000076ba8cec>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
2 locks held by khungtaskd/24:
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<00000000e806f38e>]
watchdog+0x13c/0xae0 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<0000000066146396>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
2 locks held by getty/2040:
#0: (&tty->ldisc_sem){++++++}, at: [<00000000da415ca2>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<000000001386221c>]
n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/2247:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.+.}, at: [<000000008d107f62>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
1 lock held by syz-executor.1/2249:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
3 locks held by blkid/3319:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000030c975d3>]
__blkdev_put+0xbb/0x840 fs/block_dev.c:1587
#1: (loop_index_mutex){+.+.+.}, at: [<0000000082a73b83>]
lo_release+0x1e/0x1b0 drivers/block/loop.c:1664
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000b80a519f>] __lo_release
drivers/block/loop.c:1642 [inline]
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000b80a519f>]
lo_release+0x84/0x1b0 drivers/block/loop.c:1665
1 lock held by syz-executor.5/3320:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by blkid/3321:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.4/3322:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by blkid/3323:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.3/3324:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000003b04c693>]
lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by syz-executor.2/3325:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by blkid/3326:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<00000000e5078914>]
lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by blkid/3327:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fc3e6593>]
__blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
=============================================
NMI backtrace for cpu 0
ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000000 0000000000000000
0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
ffffffff81b5aa8c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
[<00000000e26243c1>] __dump_stack lib/dump_stack.c:15 [inline]
[<00000000e26243c1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<000000005f8adca3>] nmi_cpu_backtrace.cold+0x47/0x87
lib/nmi_backtrace.c:99
[<00000000c77b010e>] nmi_trigger_cpumask_backtrace+0x124/0x155
lib/nmi_backtrace.c:60
[<000000001bcc9b0e>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<000000004bc002e2>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<000000004bc002e2>] check_hung_task kernel/hung_task.c:125 [inline]
[<000000004bc002e2>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<000000004bc002e2>] watchdog+0x661/0xae0 kernel/hung_task.c:239
[<0000000071fea858>] kthread+0x278/0x310 kernel/kthread.c:211
[<00000000d1fd0387>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff828105a2
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