INFO: task kworker/u4:3:43 blocked for more than 143 seconds.
Not tainted 6.8.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:3 state:D stack:21368 pid:43 tgid:43 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17d3/0x4a20 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6804 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6819
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
__flush_workqueue+0x730/0x1630 kernel/workqueue.c:3617
drain_workqueue+0xc9/0x390 kernel/workqueue.c:3730
destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5319
bond_destructor+0x4d/0x80 drivers/net/bonding/bond_main.c:5846
netdev_run_todo+0xd4f/0xf40 net/core/dev.c:10581
default_device_exit_batch+0x975/0x9f0 net/core/dev.c:11625
ops_exit_list net/core/net_namespace.c:175 [inline]
cleanup_net+0x775/0xb90 net/core/net_namespace.c:618
process_one_work kernel/workqueue.c:3049 [inline]
process_scheduled_works+0x913/0x14f0 kernel/workqueue.c:3125
worker_thread+0xa60/0x1000 kernel/workqueue.c:3206
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cce3060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8cce3060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8cce3060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u4:3/43:
#0: ffff888013eb5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline]
#0: ffff888013eb5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125
#1: ffffc90000b37d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline]
#1: ffffc90000b37d20 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125
#2: ffffffff8dd28890 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf5/0xb90 net/core/net_namespace.c:580
2 locks held by getty/4388:
#0: ffff888020eed0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by syz-executor.0/5923:
#0: ffff888029832070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
#0: ffff888029832070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
#1: ffff8880755460e0 (&type->s_umount_key#48/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
#2: ffff88807a4c4090 (&client->mount_mutex){+.+.}-{3:3}, at: ceph_real_mount fs/ceph/super.c:1149 [inline]
#2: ffff88807a4c4090 (&client->mount_mutex){+.+.}-{3:3}, at: ceph_get_tree+0x888/0x16a0 fs/ceph/super.c:1343
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-syzkaller #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+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4936 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:lockdep_hardirqs_on_prepare+0x3d/0x780 kernel/locking/lockdep.c:4312
Code: e4 e0 48 81 ec 80 00 00 00 65 48 8b 04 25 28 00 00 00 48 89 44 24 60 48 ba 00 00 00 00 00 fc ff df 48 c7 44 24 20 b3 8a b5 41 <48> c7 44 24 28 e4 a1 5e 8c 48 c7 44 24 30 00 5d 73 81 4c 8d 7c 24
RSP: 0018:ffffc900042a7e20 EFLAGS: 00000082
RAX: d6d49b08119a1f00 RBX: 0000000000000000 RCX: ffffffff819d2f4c
RDX: dffffc0000000000 RSI: ffffffff8af8b740 RDI: ffffffff8af8b700
RBP: ffffc900042a7ec8 R08: ffffffff8e1e932f R09: 1ffffffff1c3d265
R10: dffffc0000000000 R11: fffffbfff1c3d266 R12: ffff88807cf08000
R13: 0000000000000000 R14: ffffc900042a7f58 R15: 000000000000003d
FS: 000055555719f480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa4fba80c0 CR3: 000000007d31c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
exit_to_user_mode include/linux/entry-common.h:360 [inline]
syscall_exit_to_user_mode+0x203/0x370 kernel/entry/common.c:214
do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7faa4fa7a7d7
Code: 89 7c 24 10 48 89 4c 24 18 e8 d5 a3 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 a4 02 00 8b 44
RSP: 002b:00007ffdb776d110 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: 0000000000000000 RBX: 0000000000000127 RCX: 00007faa4fa7a7d7
RDX: 0000000040000001 RSI: 00007ffdb776d19c RDI: 00000000ffffffff
RBP: 00007ffdb776d19c R08: 0000000000000000 R09: 00007ffdb77df0b0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000003482f R14: 0000000000034825 R15: 0000000000000002