INFO: task syz-executor.3:5670 blocked for more than 143 seconds.
Not tainted 6.8.0-rc4-syzkaller-01501-g6d5c36565c16 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:20984 pid:5670 tgid:5670 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17d1/0x49f0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752
device_lock include/linux/device.h:990 [inline]
device_del+0xa6/0xa30 drivers/base/core.c:3776
device_unregister+0x20/0xc0 drivers/base/core.c:3855
nsim_bus_dev_del drivers/net/netdevsim/bus.c:317 [inline]
del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226
kernfs_fop_write_iter+0x3a4/0x500 fs/kernfs/file.c:334
call_write_iter include/linux/fs.h:2085 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa81/0xcb0 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f487fc7caef
RSP: 002b:00007ffcdcd5e720 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f487fc7caef
RDX: 0000000000000001 RSI: 00007ffcdcd5e770 RDI: 0000000000000005
RBP: 00007f487fcca021 R08: 0000000000000000 R09: 00007ffcdcd5e577
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffcdcd5e770 R14: 00007f48808d4620 R15: 0000000000000003
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4827:
#0: ffff88802a7370a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by syz-executor.2/16276:
2 locks held by kworker/u4:4/1600:
3 locks held by kworker/1:0/5459:
#0: ffff888014c8c938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff888014c8c938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc9000eeefd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc9000eeefd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#2: ffff888083a0e240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489
3 locks held by syz-executor.3/5468:
#0: ffffffff8f3dae50 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1216
#1: ffff88807fc640e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
#1: ffff88807fc640e8 (&dev->mutex){....}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
#1: ffff88807fc640e8 (&dev->mutex){....}-{3:3}, at: devlink_get_from_attrs_lock+0x159/0x3d0 net/devlink/netlink.c:196
#2: ffff8880504fe250 (&devlink->lock_key#11){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
#2: ffff8880504fe250 (&devlink->lock_key#11){+.+.}-{3:3}, at: devlink_get_from_attrs_lock+0x168/0x3d0 net/devlink/netlink.c:196
5 locks held by syz-executor.3/5670:
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2792 [inline]
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff888037f46088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff8880232171f8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecb6c28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
#4: ffff88807fc640e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
#4: ffff88807fc640e8 (&dev->mutex){....}-{3:3}, at: device_del+0xa6/0xa30 drivers/base/core.c:3776
4 locks held by syz-executor.3/7969:
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2792 [inline]
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff88809d83b888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff8880232171f8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecb6c28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.3/9632:
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2792 [inline]
#0: ffff88802abf6420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff88804309a488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff8880232171f8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecb6c28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
2 locks held by syz-executor.2/10244:
#0: ffffffff8f376f08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f376f08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6594
#1: ffffffff8e136478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#1: ffffffff8e136478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:995
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-syzkaller-01501-g6d5c36565c16 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 16112 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-01501-g6d5c36565c16 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:sched_clock_cpu+0x80/0x490 kernel/sched/clock.c:409
Code: 81 4c 8d 6c 24 40 49 c1 ed 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 4b 89 44 35 00 66 90 e8 8a 16 c7 ff 48 89 c3 48 03 1d 30 f8 17 0e <48> c7 44 24 40 0e 36 e0 45 4b c7 04 2e 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc90003527880 EFLAGS: 00000017
RAX: 00000332b3948085 RBX: 00000332af8419f0 RCX: ffff888085b01dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003527948 R08: ffffffff8134f241 R09: fffff520006a4f20
R10: dffffc0000000000 R11: fffff520006a4f20 R12: ffffc900035278e0
R13: 1ffff920006a4f18 R14: dffffc0000000000 R15: dffffc0000000000
FS: 0000555555b45480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80c5fa8000 CR3: 0000000097510000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
update_rq_clock+0xed/0x8a0 kernel/sched/core.c:766
__schedule+0x42f/0x49f0 kernel/sched/core.c:6648
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
do_nanosleep+0x196/0x600 kernel/time/hrtimer.c:2048
hrtimer_nanosleep+0x226/0x470 kernel/time/hrtimer.c:2101
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
__se_sys_clock_nanosleep+0x32a/0x3c0 kernel/time/posix-timers.c:1373
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f02340a91b5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 b9 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f ba ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffe689b5ea0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000001138 RCX: 00007f02340a91b5
RDX: 00007ffe689b5ee0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe689b5f6c R08: 0000000000000000 R09: 00007ffe689c80b0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000035a572 R14: 000000000035a554 R15: 0000000000000002