INFO: task hung in nbd_ioctl (3)
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syzbot
Nov 13, 2020, 2:37:30 AM11/13/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 27ce4f2a Linux 4.14.206
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=169ca572500000
kernel config: https://syzkaller.appspot.com/x/.config?x=32258a0e1fac372d
dashboard link: https://syzkaller.appspot.com/bug?extid=10533a0420aea96ae38a
compiler: gcc (GCC) 10.1.0-syz 20200507
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+10533a...@syzkaller.appspotmail.com
block nbd0: Receive control failed (result -107)
block nbd0: shutting down sockets
block nbd0: Receive control failed (result -107)
block nbd0: shutting down sockets
INFO: task syz-executor.3:10664 blocked for more than 140 seconds.
Not tainted 4.14.206-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28768 10664 8049 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1731
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676
nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline]
__nbd_ioctl drivers/block/nbd.c:1325 [inline]
nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1365
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1893
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45deb9
RSP: 002b:00007f36b1837c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000012f00 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd7517495f R14: 00007f36b18389c0 R15: 000000000118bf2c
Showing all locks held in the system:
1 lock held by khungtaskd/1531:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81430c44>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by in:imklog/7720:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff818f8a3b>] __fdget_pos+0x1fb/0x2b0 fs/file.c:769
2 locks held by agetty/7967:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff835e3492>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff835d87e3>] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156
3 locks held by kworker/u5:7/8083:
#0: ("knbd%d-recv"nbd->index){+.+.}, at: [<ffffffff813735a0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: ((&args->work)){+.+.}, at: [<ffffffff813735d6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
#2: (sk_lock-AF_AX25){+.+.}, at: [<ffffffff86795a18>] lock_sock include/net/sock.h:1471 [inline]
#2: (sk_lock-AF_AX25){+.+.}, at: [<ffffffff86795a18>] ax25_recvmsg+0xa8/0x7a0 net/ax25/af_ax25.c:1630
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4617 Comm: systemd-journal Not tainted 4.14.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a1aac680 task.stack: ffff8880a1ab0000
RIP: 0010:free_uid+0x243/0x330 kernel/user.c:169
RSP: 0018:ffff8880a1ab7de8 EFLAGS: 00000006
RAX: ffff8880a1aac680 RBX: ffff8880aff81ea8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88f44d20 RDI: ffffffff88f44c80
RBP: ffffffff88f44c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000297
R13: ffff8880aff81ea0 R14: 00000000ffffff9c R15: 0000562c26bd59a3
FS: 00007f9bfb5b98c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9bf8344000 CR3: 00000000a1efc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
put_cred_rcu+0x1e8/0x300 kernel/cred.c:124
__put_cred+0x1a1/0x210 kernel/cred.c:151
put_cred include/linux/cred.h:271 [inline]
SYSC_faccessat fs/open.c:444 [inline]
SyS_faccessat+0x52a/0x680 fs/open.c:353
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f9bfa8759c7
RSP: 002b:00007ffd768722a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffd768752d0 RCX: 00007f9bfa8759c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000562c26bd59a3
RBP: 00007ffd768723f0 R08: 0000562c26bcb3e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000562c28a918a0 R15: 00007ffd768728e0
Code: 02 00 0f 85 cc 00 00 00 48 8b 7d 40 e8 47 6a ad 01 48 8b 3d 00 71 f9 09 48 89 ee e8 28 ac 4c 00 5b 5d 41 5c 41 5d e9 5d 12 23 00 <e8> 58 12 23 00 e8 c3 61 0e 00 48 c7 c0 88 91 f0 88 48 ba 00 00
---
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: 27ce4f2a Linux 4.14.206
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=169ca572500000
kernel config: https://syzkaller.appspot.com/x/.config?x=32258a0e1fac372d
dashboard link: https://syzkaller.appspot.com/bug?extid=10533a0420aea96ae38a
compiler: gcc (GCC) 10.1.0-syz 20200507
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+10533a...@syzkaller.appspotmail.com
block nbd0: Receive control failed (result -107)
block nbd0: shutting down sockets
block nbd0: Receive control failed (result -107)
block nbd0: shutting down sockets
INFO: task syz-executor.3:10664 blocked for more than 140 seconds.
Not tainted 4.14.206-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28768 10664 8049 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1731
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676
nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline]
__nbd_ioctl drivers/block/nbd.c:1325 [inline]
nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1365
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1893
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45deb9
RSP: 002b:00007f36b1837c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000012f00 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd7517495f R14: 00007f36b18389c0 R15: 000000000118bf2c
Showing all locks held in the system:
1 lock held by khungtaskd/1531:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81430c44>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by in:imklog/7720:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff818f8a3b>] __fdget_pos+0x1fb/0x2b0 fs/file.c:769
2 locks held by agetty/7967:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff835e3492>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff835d87e3>] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156
3 locks held by kworker/u5:7/8083:
#0: ("knbd%d-recv"nbd->index){+.+.}, at: [<ffffffff813735a0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: ((&args->work)){+.+.}, at: [<ffffffff813735d6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
#2: (sk_lock-AF_AX25){+.+.}, at: [<ffffffff86795a18>] lock_sock include/net/sock.h:1471 [inline]
#2: (sk_lock-AF_AX25){+.+.}, at: [<ffffffff86795a18>] ax25_recvmsg+0xa8/0x7a0 net/ax25/af_ax25.c:1630
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4617 Comm: systemd-journal Not tainted 4.14.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a1aac680 task.stack: ffff8880a1ab0000
RIP: 0010:free_uid+0x243/0x330 kernel/user.c:169
RSP: 0018:ffff8880a1ab7de8 EFLAGS: 00000006
RAX: ffff8880a1aac680 RBX: ffff8880aff81ea8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88f44d20 RDI: ffffffff88f44c80
RBP: ffffffff88f44c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000297
R13: ffff8880aff81ea0 R14: 00000000ffffff9c R15: 0000562c26bd59a3
FS: 00007f9bfb5b98c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9bf8344000 CR3: 00000000a1efc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
put_cred_rcu+0x1e8/0x300 kernel/cred.c:124
__put_cred+0x1a1/0x210 kernel/cred.c:151
put_cred include/linux/cred.h:271 [inline]
SYSC_faccessat fs/open.c:444 [inline]
SyS_faccessat+0x52a/0x680 fs/open.c:353
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f9bfa8759c7
RSP: 002b:00007ffd768722a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffd768752d0 RCX: 00007f9bfa8759c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000562c26bd59a3
RBP: 00007ffd768723f0 R08: 0000562c26bcb3e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000562c28a918a0 R15: 00007ffd768728e0
Code: 02 00 0f 85 cc 00 00 00 48 8b 7d 40 e8 47 6a ad 01 48 8b 3d 00 71 f9 09 48 89 ee e8 28 ac 4c 00 5b 5d 41 5c 41 5d e9 5d 12 23 00 <e8> 58 12 23 00 e8 c3 61 0e 00 48 c7 c0 88 91 f0 88 48 ba 00 00
---
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
Jan 24, 2021, 4:19:23 PM1/24/21
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 2d2791fc Linux 4.14.217
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10153910d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=80753487c013c9c7
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12d380a0d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10533a...@syzkaller.appspotmail.com
Not tainted 4.14.217-syzkaller #0
__nbd_ioctl drivers/block/nbd.c:1326 [inline]
nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1366
RSP: 002b:00007ffdb7374f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f39
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00000000006cf018 R08: 00000000004002e0 R09: 00000000004002e0
R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000402100
R13: 0000000000402190 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/1531:
#0: (tasklist_lock){.+.+}, at: [<ffffffff86feead7>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
2 locks held by kworker/u5:0/1675:
#0: ("knbd%d-recv"nbd->index){+.+.}, at: [<ffffffff81363810>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: ((&args->work)){+.+.}, at: [<ffffffff81363846>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
1 lock held by in:imklog/7711:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff818d061b>] __fdget_pos+0x1fb/0x2b0 fs/file.c:769
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.217-syzkaller #0
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
RIP: 0010:hash_name fs/namei.c:2015 [inline]
RIP: 0010:link_path_walk+0x1ea/0x10a0 fs/namei.c:2101
RSP: 0018:ffff8880a1197ae8 EFLAGS: 00000246
RAX: ffff8880b58162c0 RBX: ffff8880b58162c0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: dffffc0000000000
RBP: 0000000000000000 R08: ffffffff8b9c2788 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a1197cf8
R13: fefefefefefefeff R14: 0000000000000000 R15: ffff888094eec9e5
FS: 00007f1c166218c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1c15bb1840
RSP: 002b:00007ffc835fb098 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffc835fb3a0 RCX: 00007f1c15bb1840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005617e738df30
RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00005617e7381040 R14: 00007ffc835fb360 R15: 00005617e738dd50
Code: fe fe fe 48 89 44 24 10 48 89 c3 eb 1e e8 0f 91 cb ff 4d 31 e6 48 83 c5 08 4c 31 f3 49 c1 c6 0c 49 01 de 48 c1 cb 13 48 8d 1c db <e8> f1 90 cb ff 48 ba 2f 2f 2f 2f 2f 2f 2f 2f 48 b8 80 80 80 80
HEAD commit: 2d2791fc Linux 4.14.217
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10153910d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=80753487c013c9c7
dashboard link: https://syzkaller.appspot.com/bug?extid=10533a0420aea96ae38a
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f2d510d00000
compiler: gcc (GCC) 10.1.0-syz 20200507
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12d380a0d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10533a...@syzkaller.appspotmail.com
block nbd0: shutting down sockets
INFO: task syz-executor744:8024 blocked for more than 140 seconds.
Not tainted 4.14.217-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor744 D28216 8024 8023 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676
nbd_start_device_ioctl drivers/block/nbd.c:1255 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676
__nbd_ioctl drivers/block/nbd.c:1326 [inline]
nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1366
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1893
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x444f39
blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1893
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RSP: 002b:00007ffdb7374f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f39
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00000000006cf018 R08: 00000000004002e0 R09: 00000000004002e0
R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000402100
R13: 0000000000402190 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/1531:
2 locks held by kworker/u5:0/1675:
#0: ("knbd%d-recv"nbd->index){+.+.}, at: [<ffffffff81363810>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: ((&args->work)){+.+.}, at: [<ffffffff81363846>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
1 lock held by in:imklog/7711:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff818d061b>] __fdget_pos+0x1fb/0x2b0 fs/file.c:769
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 0
CPU: 0 PID: 4626 Comm: systemd-journal Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a118a1c0 task.stack: ffff8880a1190000
RIP: 0010:hash_name fs/namei.c:2015 [inline]
RIP: 0010:link_path_walk+0x1ea/0x10a0 fs/namei.c:2101
RSP: 0018:ffff8880a1197ae8 EFLAGS: 00000246
RAX: ffff8880b58162c0 RBX: ffff8880b58162c0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: dffffc0000000000
RBP: 0000000000000000 R08: ffffffff8b9c2788 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a1197cf8
R13: fefefefefefefeff R14: 0000000000000000 R15: ffff888094eec9e5
FS: 00007f1c166218c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c139f7000 CR3: 00000000a1049000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
path_openat+0x15e/0x2970 fs/namei.c:3568
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1c15bb1840
RSP: 002b:00007ffc835fb098 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffc835fb3a0 RCX: 00007f1c15bb1840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005617e738df30
RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00005617e7381040 R14: 00007ffc835fb360 R15: 00005617e738dd50
Code: fe fe fe 48 89 44 24 10 48 89 c3 eb 1e e8 0f 91 cb ff 4d 31 e6 48 83 c5 08 4c 31 f3 49 c1 c6 0c 49 01 de 48 c1 cb 13 48 8d 1c db <e8> f1 90 cb ff 48 ba 2f 2f 2f 2f 2f 2f 2f 2f 48 b8 80 80 80 80
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