INFO: task hung in do_read_cache_page (2)
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syzbot
Feb 9, 2021, 3:22:14 AM2/9/21
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 811218ec Linux 4.19.172
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=153e449cd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c1cb1d27398c8808
dashboard link: https://syzkaller.appspot.com/bug?extid=ccfb42aa5b352bd23da9
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccfb42...@syzkaller.appspotmail.com
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
INFO: task systemd-udevd:25908 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
systemd-udevd D26624 25908 4698 0x00000100
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
io_schedule+0xb5/0x120 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:5181
wait_on_page_bit_common syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1123 [inline]
wait_on_page_bit+0x2c5/0x3f0 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1156
wait_on_page_locked syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:530 [inline]
wait_on_page_read syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2795 [inline]
do_read_cache_page+0x8ed/0x1170 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2834
read_mapping_page syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:402 [inline]
read_dev_sector+0xbf/0x500 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:671
read_part_sector syzkaller/managers/linux-4-19/kernel/block/partitions/check.h:38 [inline]
adfspart_check_ICS+0x114/0xe70 syzkaller/managers/linux-4-19/kernel/block/partitions/acorn.c:366
check_partition+0x390/0x690 syzkaller/managers/linux-4-19/kernel/block/partitions/check.c:167
rescan_partitions+0x1b5/0x970 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:535
bdev_disk_changed+0x179/0x1b0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1435
__blkdev_get+0x1282/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1561
blkdev_get+0xb0/0x940 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1627
blkdev_open+0x202/0x290 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 syzkaller/managers/linux-4-19/kernel/fs/open.c:796
do_last syzkaller/managers/linux-4-19/kernel/fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3537
do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567
do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085
do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f1a77374840
Code: Bad RIP value.
RSP: 002b:00007ffc0bfc5048 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000055c5ce4939d0 RCX: 00007f1a77374840
RDX: 000055c5ce1fefe3 RSI: 00000000000a0800 RDI: 000055c5ce493450
RBP: 00007ffc0bfc51c0 R08: 000055c5ce1fe670 R09: 0000000000000010
R10: 000055c5ce1fed0c R11: 0000000000000246 R12: 00007ffc0bfc5110
R13: 000055c5ce491550 R14: 0000000000000003 R15: 000000000000000e
INFO: task syz-executor.1:25920 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D28560 25920 14924 0x00000004
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3619
__mutex_lock_common syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1072
blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839
blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1888
__fput+0x2ce/0x890 syzkaller/managers/linux-4-19/kernel/fs/file_table.c:278
task_work_run+0x148/0x1c0 syzkaller/managers/linux-4-19/kernel/kernel/task_work.c:113
tracehook_notify_resume syzkaller/managers/linux-4-19/kernel/./include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:167
prepare_exit_to_usermode syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465b09
Code: Bad RIP value.
RSP: 002b:00007f6cd1281188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc232c6a7f R14: 00007f6cd1281300 R15: 0000000000022000
INFO: task syz-executor.1:25932 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29160 25932 14924 0x00000004
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3619
__mutex_lock_common syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1072
__blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
blkdev_get+0xb0/0x940 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1627
blkdev_open+0x202/0x290 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 syzkaller/managers/linux-4-19/kernel/fs/open.c:796
do_last syzkaller/managers/linux-4-19/kernel/fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3537
do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567
do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085
do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4190f4
Code: Bad RIP value.
RSP: 002b:00007f6cd125fcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004190f4
RDX: 0000000000000000 RSI: 00007f6cd125fd60 RDI: 00000000ffffff9c
RBP: 00007f6cd125fd60 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffc232c6a7f R14: 00007f6cd1260300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/1566:
#0: 00000000741693ee (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:4440
1 lock held by in:imklog/7840:
1 lock held by systemd-udevd/25908:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
1 lock held by syz-executor.1/25920:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839
1 lock held by syz-executor.1/25932:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace syzkaller/managers/linux-4-19/kernel/./include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:287
kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259
ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 37 Comm: kworker/u4:3 Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_purge_orig
RIP: 0010:arch_local_save_flags syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/paravirt.h:784 [inline]
RIP: 0010:arch_local_irq_save syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/paravirt.h:806 [inline]
RIP: 0010:lock_release+0xd2/0x8b0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3922
Code: f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c3 06 00 00 48 83 3d 66 54 a6 08 00 0f 84 1b 05 00 00 9c 58 <0f> 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 04 24 48 c7 c0
RSP: 0018:ffff8880b5177b68 EFLAGS: 00000286
RAX: 0000000000000286 RBX: ffff8880b5168300 RCX: ffffffff814bc19b
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880b5168b84
RBP: ffff8880511ab6e0 R08: 0000000000000001 R09: ffffed100a2356d9
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11016a2ef70
R13: ffffffff87d69a2c R14: dffffc0000000000 R15: 0000000000000327
FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f227ff0c020 CR3: 00000000a48de000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock_api_smp.h:174 [inline]
_raw_spin_unlock_bh+0x17/0x30 syzkaller/managers/linux-4-19/kernel/kernel/locking/spinlock.c:200
spin_unlock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock.h:374 [inline]
batadv_purge_orig_ref+0xa2c/0x1110 syzkaller/managers/linux-4-19/kernel/net/batman-adv/originator.c:1379
batadv_purge_orig+0x17/0x60 syzkaller/managers/linux-4-19/kernel/net/batman-adv/originator.c:1392
process_one_work+0x864/0x1570 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:2298
kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259
ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415
---
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 found the following issue on:
HEAD commit: 811218ec Linux 4.19.172
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=153e449cd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c1cb1d27398c8808
dashboard link: https://syzkaller.appspot.com/bug?extid=ccfb42aa5b352bd23da9
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccfb42...@syzkaller.appspotmail.com
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
INFO: task systemd-udevd:25908 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
systemd-udevd D26624 25908 4698 0x00000100
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
io_schedule+0xb5/0x120 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:5181
wait_on_page_bit_common syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1123 [inline]
wait_on_page_bit+0x2c5/0x3f0 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1156
wait_on_page_locked syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:530 [inline]
wait_on_page_read syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2795 [inline]
do_read_cache_page+0x8ed/0x1170 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2834
read_mapping_page syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:402 [inline]
read_dev_sector+0xbf/0x500 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:671
read_part_sector syzkaller/managers/linux-4-19/kernel/block/partitions/check.h:38 [inline]
adfspart_check_ICS+0x114/0xe70 syzkaller/managers/linux-4-19/kernel/block/partitions/acorn.c:366
check_partition+0x390/0x690 syzkaller/managers/linux-4-19/kernel/block/partitions/check.c:167
rescan_partitions+0x1b5/0x970 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:535
bdev_disk_changed+0x179/0x1b0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1435
__blkdev_get+0x1282/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1561
blkdev_get+0xb0/0x940 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1627
blkdev_open+0x202/0x290 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 syzkaller/managers/linux-4-19/kernel/fs/open.c:796
do_last syzkaller/managers/linux-4-19/kernel/fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3537
do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567
do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085
do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f1a77374840
Code: Bad RIP value.
RSP: 002b:00007ffc0bfc5048 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000055c5ce4939d0 RCX: 00007f1a77374840
RDX: 000055c5ce1fefe3 RSI: 00000000000a0800 RDI: 000055c5ce493450
RBP: 00007ffc0bfc51c0 R08: 000055c5ce1fe670 R09: 0000000000000010
R10: 000055c5ce1fed0c R11: 0000000000000246 R12: 00007ffc0bfc5110
R13: 000055c5ce491550 R14: 0000000000000003 R15: 000000000000000e
INFO: task syz-executor.1:25920 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D28560 25920 14924 0x00000004
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3619
__mutex_lock_common syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1072
blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839
blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1888
__fput+0x2ce/0x890 syzkaller/managers/linux-4-19/kernel/fs/file_table.c:278
task_work_run+0x148/0x1c0 syzkaller/managers/linux-4-19/kernel/kernel/task_work.c:113
tracehook_notify_resume syzkaller/managers/linux-4-19/kernel/./include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:167
prepare_exit_to_usermode syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465b09
Code: Bad RIP value.
RSP: 002b:00007f6cd1281188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc232c6a7f R14: 00007f6cd1281300 R15: 0000000000022000
INFO: task syz-executor.1:25932 blocked for more than 140 seconds.
Not tainted 4.19.172-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29160 25932 14924 0x00000004
Call Trace:
context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517
schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3619
__mutex_lock_common syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1072
__blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
blkdev_get+0xb0/0x940 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1627
blkdev_open+0x202/0x290 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 syzkaller/managers/linux-4-19/kernel/fs/open.c:796
do_last syzkaller/managers/linux-4-19/kernel/fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3537
do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567
do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085
do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4190f4
Code: Bad RIP value.
RSP: 002b:00007f6cd125fcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004190f4
RDX: 0000000000000000 RSI: 00007f6cd125fd60 RDI: 00000000ffffff9c
RBP: 00007f6cd125fd60 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffc232c6a7f R14: 00007f6cd1260300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/1566:
#0: 00000000741693ee (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:4440
1 lock held by in:imklog/7840:
1 lock held by systemd-udevd/25908:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
1 lock held by syz-executor.1/25920:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839
1 lock held by syz-executor.1/25932:
#0: 00000000b886c5b8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace syzkaller/managers/linux-4-19/kernel/./include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:287
kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259
ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 37 Comm: kworker/u4:3 Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_purge_orig
RIP: 0010:arch_local_save_flags syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/paravirt.h:784 [inline]
RIP: 0010:arch_local_irq_save syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/paravirt.h:806 [inline]
RIP: 0010:lock_release+0xd2/0x8b0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3922
Code: f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c3 06 00 00 48 83 3d 66 54 a6 08 00 0f 84 1b 05 00 00 9c 58 <0f> 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 04 24 48 c7 c0
RSP: 0018:ffff8880b5177b68 EFLAGS: 00000286
RAX: 0000000000000286 RBX: ffff8880b5168300 RCX: ffffffff814bc19b
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880b5168b84
RBP: ffff8880511ab6e0 R08: 0000000000000001 R09: ffffed100a2356d9
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11016a2ef70
R13: ffffffff87d69a2c R14: dffffc0000000000 R15: 0000000000000327
FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f227ff0c020 CR3: 00000000a48de000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock_api_smp.h:174 [inline]
_raw_spin_unlock_bh+0x17/0x30 syzkaller/managers/linux-4-19/kernel/kernel/locking/spinlock.c:200
spin_unlock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock.h:374 [inline]
batadv_purge_orig_ref+0xa2c/0x1110 syzkaller/managers/linux-4-19/kernel/net/batman-adv/originator.c:1379
batadv_purge_orig+0x17/0x60 syzkaller/managers/linux-4-19/kernel/net/batman-adv/originator.c:1392
process_one_work+0x864/0x1570 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:2298
kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259
ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415
---
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
Sep 11, 2021, 4:26:25 PM9/11/21
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: b172b44fcb17 Linux 4.19.206
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1404b743300000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9ba3521ce0be3cd
dashboard link: https://syzkaller.appspot.com/bug?extid=ccfb42aa5b352bd23da9
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f3928b300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1204d82d300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccfb42...@syzkaller.appspotmail.com
block nbd0: shutting down sockets
INFO: task syz-executor114:8099 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
io_schedule+0xb5/0x120 kernel/sched/core.c:5181
wait_on_page_bit_common mm/filemap.c:1123 [inline]
wait_on_page_bit+0x2c5/0x3f0 mm/filemap.c:1156
wait_on_page_locked include/linux/pagemap.h:531 [inline]
do_read_cache_page+0x20a/0x1170 mm/filemap.c:2873
read_mapping_page include/linux/pagemap.h:402 [inline]
read_dev_sector+0xbf/0x500 block/partition-generic.c:671
read_part_sector block/partitions/check.h:38 [inline]
adfspart_check_ICS+0x114/0xe70 block/partitions/acorn.c:366
check_partition+0x390/0x690 block/partitions/check.c:167
rescan_partitions+0x1b5/0x970 block/partition-generic.c:535
bdev_disk_changed+0x179/0x1b0 fs/block_dev.c:1435
__blkdev_get+0x1282/0x1480 fs/block_dev.c:1561
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a216b6d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a216b6de0 RDI: 00000000ffffff9c
RBP: 00007f6a216b6de0 R08: 0000000000000000 R09: 002364626e2f7665
INFO: task syz-executor114:8100 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1015 [inline]
__mutex_lock+0x604/0x1200 kernel/locking/mutex.c:1083
__blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a21695d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a21695de0 RDI: 00000000ffffff9c
RBP: 00007f6a21695de0 R08: 0000000000000000 R09: 002364626e2f7665
INFO: task syz-executor114:8101 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1015 [inline]
__mutex_lock+0x604/0x1200 kernel/locking/mutex.c:1083
__blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a21674d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a21674de0 RDI: 00000000ffffff9c
RBP: 00007f6a21674de0 R08: 0000000000000000 R09: 002364626e2f7665
Showing all locks held in the system:
1 lock held by khungtaskd/1571:
#0: 00000000a92526b4 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by in:imklog/7807:
#0: 000000004aa9779e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor114/8099:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
1 lock held by syz-executor114/8100:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
1 lock held by syz-executor114/8101:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.206-syzkaller #0
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
Code: 6e 00 e9 a7 fd ff ff e8 08 de 6e 00 e9 ea fc ff ff 48 8b 3c 24 e8 8a de 6e 00 e9 7b fe ff ff 90 90 90 90 90 41 57 89 d0 41 56 <41> 55 41 54 4c 8d 64 87 fc 55 53 48 83 ec 10 85 d2 0f 84 95 00 00
RSP: 0018:ffff8880a0f979b8 EFLAGS: 00000012
RAX: 0000000000000008 RBX: 1ffff110141f2f43 RCX: ffffffff810059f0
RDX: 0000000000000008 RSI: ffffffff8b8cd332 RDI: ffffffff8b304eb0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8b8cd332
R10: ffff8880a0f97b5f R11: 0000000000074071 R12: ffff8880a0f97b48
R13: ffff8880a0f97b35 R14: ffff8880a0f97b00 R15: ffffffff810059f0
FS: 00007f4691df28c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
unwind_next_frame+0x339/0x1400 arch/x86/kernel/unwind_orc.c:422
__save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
save_stack mm/kasan/kasan.c:448 [inline]
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
aa_free_file_ctx security/apparmor/include/file.h:76 [inline]
apparmor_file_free_security+0x9a/0xd0 security/apparmor/lsm.c:448
security_file_free+0x3e/0x70 security/security.c:885
file_free fs/file_table.c:54 [inline]
__fput+0x42a/0x890 fs/file_table.c:294
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f4691381840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffd29f02868 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: fffffffffffffffe RBX: 00007ffd29f02b70 RCX: 00007f4691381840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000565084a88300
RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000565084a84040 R14: 00007ffd29f02b30 R15: 0000565084a91470
----------------
Code disassembly (best guess), 2 bytes skipped:
0: e9 a7 fd ff ff jmpq 0xfffffdac
5: e8 08 de 6e 00 callq 0x6ede12
a: e9 ea fc ff ff jmpq 0xfffffcf9
f: 48 8b 3c 24 mov (%rsp),%rdi
13: e8 8a de 6e 00 callq 0x6edea2
18: e9 7b fe ff ff jmpq 0xfffffe98
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 41 57 push %r15
24: 89 d0 mov %edx,%eax
26: 41 56 push %r14
* 28: 41 55 push %r13 <-- trapping instruction
2a: 41 54 push %r12
2c: 4c 8d 64 87 fc lea -0x4(%rdi,%rax,4),%r12
31: 55 push %rbp
32: 53 push %rbx
33: 48 83 ec 10 sub $0x10,%rsp
37: 85 d2 test %edx,%edx
39: 0f .byte 0xf
3a: 84 .byte 0x84
3b: 95 xchg %eax,%ebp
HEAD commit: b172b44fcb17 Linux 4.19.206
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1404b743300000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9ba3521ce0be3cd
dashboard link: https://syzkaller.appspot.com/bug?extid=ccfb42aa5b352bd23da9
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f3928b300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1204d82d300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccfb42...@syzkaller.appspotmail.com
INFO: task syz-executor114:8099 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor114 D27064 8099 8088 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
io_schedule+0xb5/0x120 kernel/sched/core.c:5181
wait_on_page_bit_common mm/filemap.c:1123 [inline]
wait_on_page_bit+0x2c5/0x3f0 mm/filemap.c:1156
wait_on_page_locked include/linux/pagemap.h:531 [inline]
do_read_cache_page+0x20a/0x1170 mm/filemap.c:2873
read_mapping_page include/linux/pagemap.h:402 [inline]
read_dev_sector+0xbf/0x500 block/partition-generic.c:671
read_part_sector block/partitions/check.h:38 [inline]
adfspart_check_ICS+0x114/0xe70 block/partitions/acorn.c:366
check_partition+0x390/0x690 block/partitions/check.c:167
rescan_partitions+0x1b5/0x970 block/partition-generic.c:535
bdev_disk_changed+0x179/0x1b0 fs/block_dev.c:1435
__blkdev_get+0x1282/0x1480 fs/block_dev.c:1561
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a216b6d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a216b6de0 RDI: 00000000ffffff9c
RBP: 00007f6a216b6de0 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe65818f1f R14: 00007f6a216b7300 R15: 0000000000022000
INFO: task syz-executor114:8100 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor114 D28976 8100 8088 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1015 [inline]
__mutex_lock+0x604/0x1200 kernel/locking/mutex.c:1083
__blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a21695d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a21695de0 RDI: 00000000ffffff9c
RBP: 00007f6a21695de0 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe65818f1f R14: 00007f6a21696300 R15: 0000000000022000
INFO: task syz-executor114:8101 blocked for more than 140 seconds.
Not tainted 4.19.206-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor114 D28600 8101 8088 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1015 [inline]
__mutex_lock+0x604/0x1200 kernel/locking/mutex.c:1083
__blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
blkdev_get+0xb0/0x940 fs/block_dev.c:1627
blkdev_open+0x202/0x290 fs/block_dev.c:1788
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x406db4
Code: Bad RIP value.
RSP: 002b:00007f6a21674d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406db4
RDX: 0000000000000000 RSI: 00007f6a21674de0 RDI: 00000000ffffff9c
RBP: 00007f6a21674de0 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe65818f1f R14: 00007f6a21675300 R15: 0000000000022000
Showing all locks held in the system:
#0: 00000000a92526b4 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by in:imklog/7807:
#0: 000000004aa9779e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor114/8099:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
1 lock held by syz-executor114/8100:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
1 lock held by syz-executor114/8101:
#0: 000000009cf650ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.206-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]
Call Trace:
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4694 Comm: systemd-journal Not tainted 4.19.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__orc_find+0x6/0xf0 arch/x86/kernel/unwind_orc.c:31
Code: 6e 00 e9 a7 fd ff ff e8 08 de 6e 00 e9 ea fc ff ff 48 8b 3c 24 e8 8a de 6e 00 e9 7b fe ff ff 90 90 90 90 90 41 57 89 d0 41 56 <41> 55 41 54 4c 8d 64 87 fc 55 53 48 83 ec 10 85 d2 0f 84 95 00 00
RSP: 0018:ffff8880a0f979b8 EFLAGS: 00000012
RAX: 0000000000000008 RBX: 1ffff110141f2f43 RCX: ffffffff810059f0
RDX: 0000000000000008 RSI: ffffffff8b8cd332 RDI: ffffffff8b304eb0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8b8cd332
R10: ffff8880a0f97b5f R11: 0000000000074071 R12: ffff8880a0f97b48
R13: ffff8880a0f97b35 R14: ffff8880a0f97b00 R15: ffffffff810059f0
FS: 00007f4691df28c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f468f1d4000 CR3: 00000000a0fad000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
orc_find arch/x86/kernel/unwind_orc.c:159 [inline]
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
unwind_next_frame+0x339/0x1400 arch/x86/kernel/unwind_orc.c:422
__save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
save_stack mm/kasan/kasan.c:448 [inline]
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
aa_free_file_ctx security/apparmor/include/file.h:76 [inline]
apparmor_file_free_security+0x9a/0xd0 security/apparmor/lsm.c:448
security_file_free+0x3e/0x70 security/security.c:885
file_free fs/file_table.c:54 [inline]
__fput+0x42a/0x890 fs/file_table.c:294
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f4691381840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffd29f02868 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: fffffffffffffffe RBX: 00007ffd29f02b70 RCX: 00007f4691381840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000565084a88300
RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000565084a84040 R14: 00007ffd29f02b30 R15: 0000565084a91470
----------------
Code disassembly (best guess), 2 bytes skipped:
0: e9 a7 fd ff ff jmpq 0xfffffdac
5: e8 08 de 6e 00 callq 0x6ede12
a: e9 ea fc ff ff jmpq 0xfffffcf9
f: 48 8b 3c 24 mov (%rsp),%rdi
13: e8 8a de 6e 00 callq 0x6edea2
18: e9 7b fe ff ff jmpq 0xfffffe98
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 41 57 push %r15
24: 89 d0 mov %edx,%eax
26: 41 56 push %r14
* 28: 41 55 push %r13 <-- trapping instruction
2a: 41 54 push %r12
2c: 4c 8d 64 87 fc lea -0x4(%rdi,%rax,4),%r12
31: 55 push %rbp
32: 53 push %rbx
33: 48 83 ec 10 sub $0x10,%rsp
37: 85 d2 test %edx,%edx
39: 0f .byte 0xf
3a: 84 .byte 0x84
3b: 95 xchg %eax,%ebp
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