INFO: task syz.0.795:8418 blocked for more than 143 seconds.
Not tainted 6.11.0-rc6-syzkaller-01487-g3cfb5aa10cb7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.795 state:D stack:24672 pid:8418 tgid:8418 ppid:6320 flags:0x00000000
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
pipe_release+0x4e/0x330 fs/pipe.c:727
__fput+0x24a/0x8a0 fs/file_table.c:422
task_work_run+0x24f/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: 0033:0x7f3efbb7def9
RSP: 002b:00007ffdb3a91ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f3efbd37a80 RCX: 00007f3efbb7def9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3efbd37a80 R08: 0000000000000006 R09: 00007ffdb3a921cf
R10: 00000000003ffbd4 R11: 0000000000000246 R12: 0000000000044446
R13: 00007ffdb3a91fe0 R14: 0000000000000032 R15: ffffffffffffffff
INFO: task syz.0.795:8425 blocked for more than 145 seconds.
Not tainted 6.11.0-rc6-syzkaller-01487-g3cfb5aa10cb7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.795 state:D stack:27360 pid:8425 tgid:8418 ppid:6320 flags:0x00004000
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
pipe_ioctl+0xa0/0x480 fs/pipe.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
do_vfs_ioctl+0xece/0x2e50 fs/ioctl.c:861
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3efbb7def9
RSP: 002b:00007f3efb5bd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3efbd36130 RCX: 00007f3efbb7def9
RDX: 0000000000000000 RSI: 000000000000541b RDI: 0000000000000006
RBP: 00007f3efbbf0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3efbd36130 R15: 00007ffdb3a91d78
Showing all locks held in the system:
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
2 locks held by kworker/0:2/942:
#0: ffff8880b883e758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560
#1: ffffc90004007d00 ((debug_obj_work).work){+.+.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989
3 locks held by kworker/u8:10/3016:
#0: ffff88802fa4b148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88802fa4b148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc9000a547d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc9000a547d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8fc8cc48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4736
2 locks held by udevd/4687:
2 locks held by getty/4995:
#0: ffff8880353f80a0 (&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+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by dhcpcd/5054:
1 lock held by syz.0.795/8418:
#0: ffff88807c958468 (&pipe->mutex){+.+.}-{3:3}, at: pipe_release+0x4e/0x330 fs/pipe.c:727
1 lock held by syz.0.795/8422:
#0: ffff88807c958468 (&pipe->mutex){+.+.}-{3:3}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292
1 lock held by syz.0.795/8425:
#0: ffff88807c958468 (&pipe->mutex){+.+.}-{3:3}, at: pipe_ioctl+0xa0/0x480 fs/pipe.c:622
2 locks held by syz.4.798/8436:
#0: ffffffff8fc8cc48 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8fc8cc48 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3511
#1: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline]
#1: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-01487-g3cfb5aa10cb7 #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+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/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: 8437 Comm: syz.4.798 Not tainted 6.11.0-rc6-syzkaller-01487-g3cfb5aa10cb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0xea/0x780 kernel/locking/lockdep.c:4339
Code: 9a 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 33 05 00 00 83 3d c8 98 c4 18 00 0f 85 a8 00 00 00 4c 8d 74 24 40 4c 89 f3 48 c1 eb 03 <80> 3c 13 00 74 12 4c 89 f7 e8 c8 42 8b 00 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90009d2f900 EFLAGS: 00000806
RAX: 0000000000000004 RBX: 1ffff920013a5f28 RCX: ffffffff9a342903
RDX: dffffc0000000000 RSI: ffffffff8c608da0 RDI: ffffffff8c608d60
RBP: ffffc90009d2f9a8 R08: ffffffff901898ef R09: 1ffffffff203131d
R10: dffffc0000000000 R11: fffffbfff203131e R12: dffffc0000000000
R13: 1ffff920013a5f40 R14: ffffc90009d2f940 R15: 1ffff920013a5f24
FS: 00007f8f5a0216c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558af4fbe680 CR3: 000000005ec4c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61
__local_bh_enable_ip+0x168/0x200 kernel/softirq.c:387
local_bh_enable include/linux/bottom_half.h:33 [inline]
fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:331 [inline]
__fpu_restore_sig arch/x86/kernel/fpu/signal.c:359 [inline]
fpu__restore_sig+0x969/0x11b0 arch/x86/kernel/fpu/signal.c:493
restore_sigcontext+0x675/0x7d0 arch/x86/kernel/signal_64.c:95
__do_sys_rt_sigreturn+0x17f/0x270 arch/x86/kernel/signal_64.c:263
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f5917def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f5a0210e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f8f59335f88 RCX: 00007f8f5917def9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8f59335f88
RBP: 00007f8f59335f80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8f59335f8c
R13: 0000000000000000 R14: 00007ffe6473cb80 R15: 00007ffe6473cc68