INFO: task hung in ubi_detach_mtd_dev (2)
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syzbot
Jul 15, 2020, 12:30:18 PM7/15/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dce0f886 Linux 4.19.132
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1369b8d7100000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea24367973479f36
dashboard link: https://syzkaller.appspot.com/bug?extid=85e4006490dfbecfd327
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1501d07d100000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+85e400...@syzkaller.appspotmail.com
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.0:23522 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D29904 23522 6474 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_timeout+0x90e/0xef0 kernel/time/timer.c:1782
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
kthread_stop+0x109/0x6b0 kernel/kthread.c:550
ubi_detach_mtd_dev+0x21d/0x526 drivers/mtd/ubi/build.c:1093
ctrl_cdev_ioctl+0x1be/0x2b0 drivers/mtd/ubi/cdev.c:1051
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f35e1018c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f35e10196d4
INFO: task syz-executor.0:23527 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D29904 23527 6474 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f35e0ff7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f35e0ff86d4
INFO: task syz-executor.5:23533 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D29904 23533 6478 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f3ba7e7ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f3ba7e7f6d4
INFO: task syz-executor.5:23537 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D29904 23537 6478 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f3ba7e5dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f3ba7e5e6d4
INFO: task syz-executor.1:23546 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29904 23546 6469 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f75960cac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f75960cb6d4
INFO: task syz-executor.1:23552 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29904 23552 6469 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f75960a9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f75960aa6d4
INFO: task syz-executor.2:23556 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29904 23556 6477 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f6be5c41c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f6be5c426d4
INFO: task syz-executor.2:23561 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29904 23561 6477 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f6be5c20c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f6be5c216d4
INFO: task syz-executor.4:23563 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29904 23563 6475 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f9138fb2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f9138fb36d4
INFO: task syz-executor.4:23568 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29904 23568 6475 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f9138f91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f9138f926d4
Showing all locks held in the system:
1 lock held by khungtaskd/1083:
#0: 00000000f9bd2e65 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/6136:
1 lock held by syz-executor.0/23522:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.0/23527:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.5/23533:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.5/23537:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.1/23546:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.1/23552:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.2/23556:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.2/23561:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.4/23563:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.4/23568:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.3/23565:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.3/23569:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1083 Comm: khungtaskd Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3694 Comm: systemd-journal Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2316 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2336 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:2390 [inline]
RIP: 0010:__lock_acquire+0xbb3/0x3ff0 kernel/locking/lockdep.c:3415
Code: 80 46 86 c8 61 48 b8 00 00 00 00 00 fc ff df 49 0f af cc 48 c1 e9 31 4c 8d 04 cd 80 68 3d 8b 4c 89 c2 48 c1 ea 03 80 3c 02 00 <0f> 85 83 25 00 00 48 8b 1c cd 80 68 3d 8b 48 85 db 74 55 48 83 eb
RSP: 0018:ffff888093e479c8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 6fc0139f2baac99d RCX: 0000000000007187
RDX: 1ffffffff1681e97 RSI: 000000006993aba4 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8b40f4b8 R09: 0000000000000001
R10: ffff888093e3cbb0 R11: 0000000000000000 R12: 53ceec0cbf2791cb
R13: ffff888093e3c300 R14: ffff888093e3cbc8 R15: 0000000000000000
FS: 00007f2a7bacb8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40340057a0 CR3: 0000000094a20000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
ep_scan_ready_list+0x291/0x9a0 fs/eventpoll.c:710
ep_send_events fs/eventpoll.c:1713 [inline]
ep_poll+0x36f/0xcb0 fs/eventpoll.c:1840
do_epoll_wait+0x1aa/0x200 fs/eventpoll.c:2198
__do_sys_epoll_wait fs/eventpoll.c:2208 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2205 [inline]
__x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2205
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f2a7ad952e3
Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24
RSP: 002b:00007ffe21ca7fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 000055f00063f200 RCX: 00007f2a7ad952e3
RDX: 0000000000000013 RSI: 00007ffe21ca7fb0 RDI: 0000000000000008
RBP: 00007ffe21ca81a0 R08: 00007ffe21ddc000 R09: 00000210d5a0c57f
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe21ca7fb0
R13: 0000000000000001 R14: ffffffffffffffff R15: 0005aa7d0692a092
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following issue on:
HEAD commit: dce0f886 Linux 4.19.132
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1369b8d7100000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea24367973479f36
dashboard link: https://syzkaller.appspot.com/bug?extid=85e4006490dfbecfd327
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1501d07d100000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+85e400...@syzkaller.appspotmail.com
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.0:23522 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D29904 23522 6474 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_timeout+0x90e/0xef0 kernel/time/timer.c:1782
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
kthread_stop+0x109/0x6b0 kernel/kthread.c:550
ubi_detach_mtd_dev+0x21d/0x526 drivers/mtd/ubi/build.c:1093
ctrl_cdev_ioctl+0x1be/0x2b0 drivers/mtd/ubi/cdev.c:1051
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f35e1018c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f35e10196d4
INFO: task syz-executor.0:23527 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D29904 23527 6474 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f35e0ff7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f35e0ff86d4
INFO: task syz-executor.5:23533 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D29904 23533 6478 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f3ba7e7ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f3ba7e7f6d4
INFO: task syz-executor.5:23537 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D29904 23537 6478 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f3ba7e5dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f3ba7e5e6d4
INFO: task syz-executor.1:23546 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29904 23546 6469 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f75960cac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f75960cb6d4
INFO: task syz-executor.1:23552 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29904 23552 6469 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f75960a9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f75960aa6d4
INFO: task syz-executor.2:23556 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29904 23556 6477 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f6be5c41c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f6be5c426d4
INFO: task syz-executor.2:23561 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29904 23561 6477 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f6be5c20c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f6be5c216d4
INFO: task syz-executor.4:23563 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29904 23563 6475 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f9138fb2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f9138fb36d4
INFO: task syz-executor.4:23568 blocked for more than 140 seconds.
Not tainted 4.19.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29904 23568 6475 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f9138f91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e2660 RCX: 000000000045cba9
RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000215 R14: 00000000004c472a R15: 00007f9138f926d4
Showing all locks held in the system:
1 lock held by khungtaskd/1083:
#0: 00000000f9bd2e65 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/6136:
1 lock held by syz-executor.0/23522:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.0/23527:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.5/23533:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.5/23537:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.1/23546:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.1/23552:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.2/23556:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.2/23561:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.4/23563:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.4/23568:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
1 lock held by syz-executor.3/23565:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1050
1 lock held by syz-executor.3/23569:
#0: 000000008453d505 (ubi_devices_mutex){+.+.}, at: ctrl_cdev_ioctl+0x213/0x2b0 drivers/mtd/ubi/cdev.c:1025
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1083 Comm: khungtaskd Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3694 Comm: systemd-journal Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2316 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2336 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:2390 [inline]
RIP: 0010:__lock_acquire+0xbb3/0x3ff0 kernel/locking/lockdep.c:3415
Code: 80 46 86 c8 61 48 b8 00 00 00 00 00 fc ff df 49 0f af cc 48 c1 e9 31 4c 8d 04 cd 80 68 3d 8b 4c 89 c2 48 c1 ea 03 80 3c 02 00 <0f> 85 83 25 00 00 48 8b 1c cd 80 68 3d 8b 48 85 db 74 55 48 83 eb
RSP: 0018:ffff888093e479c8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 6fc0139f2baac99d RCX: 0000000000007187
RDX: 1ffffffff1681e97 RSI: 000000006993aba4 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8b40f4b8 R09: 0000000000000001
R10: ffff888093e3cbb0 R11: 0000000000000000 R12: 53ceec0cbf2791cb
R13: ffff888093e3c300 R14: ffff888093e3cbc8 R15: 0000000000000000
FS: 00007f2a7bacb8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40340057a0 CR3: 0000000094a20000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
ep_scan_ready_list+0x291/0x9a0 fs/eventpoll.c:710
ep_send_events fs/eventpoll.c:1713 [inline]
ep_poll+0x36f/0xcb0 fs/eventpoll.c:1840
do_epoll_wait+0x1aa/0x200 fs/eventpoll.c:2198
__do_sys_epoll_wait fs/eventpoll.c:2208 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2205 [inline]
__x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2205
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f2a7ad952e3
Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24
RSP: 002b:00007ffe21ca7fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 000055f00063f200 RCX: 00007f2a7ad952e3
RDX: 0000000000000013 RSI: 00007ffe21ca7fb0 RDI: 0000000000000008
RBP: 00007ffe21ca81a0 R08: 00007ffe21ddc000 R09: 00000210d5a0c57f
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe21ca7fb0
R13: 0000000000000001 R14: ffffffffffffffff R15: 0005aa7d0692a092
---
This report is generated by a bot. It may contain errors.
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