INFO: task syz.4.2320:15162 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2320 state:D stack:25608 pid:15162 tgid:15162 ppid:8880 task_flags:0x400040 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5254 [inline]
__schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
__schedule_loop kernel/sched/core.c:6944 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6959
request_wait_answer fs/fuse/dev.c:585 [inline]
__fuse_request_send fs/fuse/dev.c:599 [inline]
__fuse_simple_request+0x11cc/0x1bb0 fs/fuse/dev.c:693
fuse_simple_request fs/fuse/fuse_i.h:1250 [inline]
fuse_flush+0x5d4/0x800 fs/fuse/file.c:482
filp_flush+0xbd/0x190 fs/open.c:1549
filp_close+0x1d/0x40 fs/open.c:1562
__range_close fs/file.c:767 [inline]
__do_sys_close_range fs/file.c:826 [inline]
__se_sys_close_range+0x359/0x650 fs/file.c:790
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c68b8efc9
RSP: 002b:00007fff73f906f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f1c68de7da0 RCX: 00007f1c68b8efc9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1c68de7da0 R08: 0000000000000144 R09: 0000001273f909ef
R10: 00007f1c68de7cb0 R11: 0000000000000246 R12: 00000000000b67a6
R13: 00007fff73f907f0 R14: ffffffffffffffff R15: 00007fff73f90810
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13d720 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13d720 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e13d720 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/1:1/43:
#0: ffff8880b873a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:638
#1: ffff8880b8724048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
1 lock held by dhcpcd/5493:
1 lock held by dhcpcd/5626:
2 locks held by syz-executor/5811:
2 locks held by getty/7169:
#0: ffff88803378d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9001b8332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/9728:
1 lock held by syz-executor/12166:
1 lock held by syz-executor/15013:
1 lock held by syz.4.2320/15163:
1 lock held by syz.4.2320/15167:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:337 [inline]
watchdog+0xfa9/0xff0 kernel/hung_task.c:500
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5811 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:sigequalsets include/linux/signal.h:-1 [inline]
RIP: 0010:__set_current_blocked+0x75/0x2c0 kernel/signal.c:3219
Code: 2b 00 74 08 4c 89 f7 e8 d9 8d 9e 00 4c 89 74 24 08 4d 8b 3e 4d 89 ee 49 c1 ee 03 41 80 3c 2e 00 74 08 4c 89 ef e8 bb 8d 9e 00 <4c> 89 2c 24 4d 8b 6d 00 4c 89 ff 4c 89 ee e8 38 91 38 00 4d 39 ef
RSP: 0018:ffffc900040cfcd0 EFLAGS: 00000246
RAX: ffffffff8187e491 RBX: 1ffff110061b3c86 RCX: ffff888030d9dac0
RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffffc900040cfd38
RBP: dffffc0000000000 R08: ffffffff8f9e8177 R09: 1ffffffff1f3d02e
R10: dffffc0000000000 R11: fffffbfff1f3d02f R12: ffff888030d9dac0
R13: ffffc900040cfd38 R14: 1ffff92000819fa7 R15: 0000000000000000
FS: 000055556108c500(0000) GS:ffff888125def000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb5c38d64c0 CR3: 000000002175c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 000000000000000e DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
set_current_blocked kernel/signal.c:3208 [inline]
signal_delivered kernel/signal.c:3070 [inline]
signal_setup_done+0x188/0x310 kernel/signal.c:3082
handle_signal arch/x86/kernel/signal.c:312 [inline]
arch_do_signal_or_restart+0x485/0x790 arch/x86/kernel/signal.c:339
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1660a4d9c0
Code: 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 fb 44 8d 56
RSP: 002b:00007ffd88455178 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007ffd88455820 RCX: 00007f1660b8d99d
RDX: 00007ffd88455180 RSI: 00007ffd884552b0 RDI: 0000000000000011
RBP: 0000000000000000 R08: 7fffffffffffffff R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000246 R12: 00007ffd88455b40
R13: 0000000000000004 R14: 00007ffd8845572c R15: 00007ffd884557c0