INFO: task syz.0.681:10033 blocked for more than 143 seconds.
Not tainted 6.11.0-rc6-syzkaller-00308-gb31c44928842 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.681 state:D stack:21976 pid:10033 tgid:10033 ppid:9168 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
eventpoll_release_file+0xcb/0x1c0 fs/eventpoll.c:1106
eventpoll_release include/linux/eventpoll.h:53 [inline]
__fput+0x6e0/0x8a0 fs/file_table.c:413
task_work_run+0x251/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdce077cef9
RSP: 002b:00007ffc68ad96c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fdce0937a80 RCX: 00007fdce077cef9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fdce0937a80 R08: 0000000000000006 R09: 00007ffc68ad99bf
R10: 00000000003ffcc4 R11: 0000000000000246 R12: 00000000000b70b5
R13: 00007ffc68ad97d0 R14: 0000000000000032 R15: ffffffffffffffff
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
#0: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
1 lock held by khungtaskd/30:
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
5 locks held by kworker/u8:7/1286:
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc90004697d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc90004697d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8fc7f8d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
#3: ffffffff8fc8c488 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xa90 net/core/dev.c:11883
#4: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
#4: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
2 locks held by kworker/u8:8/2522:
2 locks held by dhcpcd/4900:
#0: ffff888062192678 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: __netlink_dump_start+0x119/0x790 net/netlink/af_netlink.c:2404
#1: ffffffff8fc8c488 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#1: ffffffff8fc8c488 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_dumpit+0x99/0x200 net/core/rtnetlink.c:6506
2 locks held by getty/4989:
#0: ffff888034a990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.0.681/10033:
#0: ffff88802566a868 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xcb/0x1c0 fs/eventpoll.c:1106
3 locks held by syz.0.681/10037:
1 lock held by udevd/10253:
1 lock held by syz-executor/10339:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00308-gb31c44928842 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10251 Comm: syz-executor Not tainted 6.11.0-rc6-syzkaller-00308-gb31c44928842 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:unwind_next_frame+0x6b0/0x2a00 arch/x86/kernel/unwind_orc.c:505
Code: e8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 88 1b 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 93 1b 00 00 0f b6 5d 01 <83> e3 07 48 89 df 48 c7 c6 80 3d 7a 8e e8 1e 64 52 00 48 85 db 74
RSP: 0018:ffffc9000327f608 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff888027e33c00
RDX: 0000000000000000 RSI: ffffffff81fa9c36 RDI: ffffffff81fa9c40
RBP: ffffffff90a9ff12 R08: ffffffff81412c60 R09: ffffc9000327f7d0
R10: 0000000000000003 R11: ffffffff817f2f80 R12: ffffffff9031102c
R13: dffffc0000000000 R14: 1ffff9200064fedc R15: ffffffff90a9ff0e
FS: 0000555563e35500(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008040 CR3: 000000006ba3c000 CR4: 0000000000350ef0
Call Trace:
arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2256 [inline]
slab_free mm/slub.c:4477 [inline]
kmem_cache_free+0x145/0x350 mm/slub.c:4552
__sigqueue_free kernel/signal.c:451 [inline]
collect_signal kernel/signal.c:594 [inline]
__dequeue_signal+0x4ac/0x5c0 kernel/signal.c:616
dequeue_signal+0x169/0x5a0 kernel/signal.c:639
get_signal+0x602/0x1740 kernel/signal.c:2796
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6968d7ecc4
Code: 89 4c 24 1c e8 ed 5a 02 00 44 8b 54 24 1c 8b 3c 24 45 31 c9 89 c5 48 8b 54 24 10 48 8b 74 24 08 45 31 c0 b8 2d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 04 24 e8 39 5b 02 00 48 8b 04
RSP: 002b:00007ffdcd30b5e0 EFLAGS: 00000246
RAX: 0000000000000024 RBX: 00007f6969a635c0 RCX: 00007f6968d7ecc4
RDX: 0000000000001000 RSI: 00007f6969a63610 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 0000000000000000 R14: 00007f6969a63610 R15: 0000000000000000