INFO: task syz-executor.3:19554 can't die for more than 143 seconds.
syz-executor.3 D28072 19554 19085 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3265 [inline]
__schedule+0x76e/0x17a0 kernel/sched/core.c:3937
schedule+0xd9/0x260 kernel/sched/core.c:4004
schedule_timeout+0x717/0xc50 kernel/time/timer.c:1869
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
flush_workqueue+0x40f/0x14c0 kernel/workqueue.c:2826
nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline]
__nbd_ioctl drivers/block/nbd.c:1329 [inline]
nbd_ioctl+0xb32/0xc50 drivers/block/nbd.c:1369
__blkdev_driver_ioctl block/ioctl.c:304 [inline]
blkdev_ioctl+0xedb/0x1c20 block/ioctl.c:606
block_ioctl+0xee/0x130 fs/block_dev.c:1954
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8
RSP: 002b:00007f0aebf9ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0aebf9b6d4
R13: 00000000004c3166 R14: 00000000004d68c8 R15: 00000000ffffffff
INFO: task syz-executor.3:19554 blocked for more than 143 seconds.
Not tainted 5.3.0-rc6-next-20190827 #74
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28072 19554 19085 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3265 [inline]
__schedule+0x76e/0x17a0 kernel/sched/core.c:3937
schedule+0xd9/0x260 kernel/sched/core.c:4004
schedule_timeout+0x717/0xc50 kernel/time/timer.c:1869
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
flush_workqueue+0x40f/0x14c0 kernel/workqueue.c:2826
nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline]
__nbd_ioctl drivers/block/nbd.c:1329 [inline]
nbd_ioctl+0xb32/0xc50 drivers/block/nbd.c:1369
__blkdev_driver_ioctl block/ioctl.c:304 [inline]
blkdev_ioctl+0xedb/0x1c20 block/ioctl.c:606
block_ioctl+0xee/0x130 fs/block_dev.c:1954
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8
RSP: 002b:00007f0aebf9ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0aebf9b6d4
R13: 00000000004c3166 R14: 00000000004d68c8 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1064:
#0: ffffffff88fa7f00 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337
2 locks held by kworker/u5:0/1523:
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8880899386e8 ((wq_completion)knbd3-recv){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
#1: ffff8880a625fdc0 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
1 lock held by rsyslogd/8873:
#0: ffff888097e06160 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/8963:
#0: ffff8880901e8190 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8964:
#0: ffff88809f282590 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8965:
#0: ffff8880a0a771d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8966:
#0: ffff8880a0a760d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8967:
#0: ffff8880a0a76950 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8968:
#0: ffff8880a38a6c10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005f052e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8969:
#0: ffff8880908f89d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90005ef12e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1064 Comm: khungtaskd Not tainted 5.3.0-rc6-next-20190827 #74
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+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:269 [inline]
watchdog+0xc99/0x1360 kernel/hung_task.c:353
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 715 Comm: kworker/u4:3 Not tainted 5.3.0-rc6-next-20190827 #74
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:batadv_nc_purge_paths+0xee/0x370 net/batman-adv/network-coding.c:442
Code: 48 6b db 38 48 03 58 08 48 89 df 48 89 5d b8 e8 78 86 1c 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 e0 01 00 00 4d 8b 24 24 <eb> 30 e8 fb b7 4b fa e8 e6 40 7f fe 31 ff 41 89 c7 89 c6 e8 6a b9
RSP: 0018:ffff8880a85f7c60 EFLAGS: 00000246
RAX: 1ffff11015234dc8 RBX: ffff8880a0ad5580 RCX: ffffffff8159594a
RDX: 1ffff1101415aab2 RSI: 0000000000000004 RDI: ffff8880a85f7bc8
RBP: ffff8880a85f7cd0 R08: 0000000000000004 R09: ffffed10150bef7a
R10: ffffed10150bef79 R11: 0000000000000003 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff87268210 R15: 0000000000000010
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4312b3b58 CR3: 00000000a7052000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
batadv_nc_worker+0x2cf/0x760 net/batman-adv/network-coding.c:721
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352