INFO: task syz.4.94:4579 blocked for more than 143 seconds.
Not tainted 6.1.135-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.94 state:D stack:26240 pid:4579 ppid:4251 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
request_wait_answer fs/fuse/dev.c:407 [inline]
__fuse_request_send fs/fuse/dev.c:426 [inline]
fuse_simple_request+0x1161/0x1b60 fs/fuse/dev.c:513
fuse_flush+0x5a1/0x820 fs/fuse/file.c:521
filp_close+0xaa/0x150 fs/open.c:1431
__range_close fs/file.c:705 [inline]
__close_range+0x539/0x730 fs/file.c:755
__do_sys_close_range fs/open.c:1476 [inline]
__se_sys_close_range fs/open.c:1473 [inline]
__x64_sys_close_range+0x76/0x80 fs/open.c:1473
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7ddd8e969
RSP: 002b:00007fffa5036638 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00000000000159cb RCX: 00007fd7ddd8e969
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fd7ddfb7ba0 R08: 0000000000000001 R09: 00000009a503692f
R10: 00007fd7dda00000 R11: 0000000000000246 R12: 00007fd7ddfb608c
R13: 00007fd7ddfb6080 R14: ffffffffffffffff R15: 00007fffa5036750
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c92b370 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c92bb90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8c92a9e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8c92a9e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8c92a9e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4009:
#0: ffff8880307e9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
2 locks held by dhcpcd/4068:
1 lock held by syz-executor/4251:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4650 Comm: syz.0.122 Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:__lock_acquire+0x1f5/0x7c50 kernel/locking/lockdep.c:4955
Code: 44 89 6c 24 34 4c 89 74 24 40 44 8b 6d 20 48 c7 c0 00 f1 23 90 49 29 c7 49 c1 ff 06 48 ba ab aa aa aa aa aa aa aa 49 0f af d7 <41> 89 d7 48 8b 44 24 60 48 85 c0 4c 89 a4 24 88 00 00 00 0f 84 3d
RSP: 0018:ffffc900000079e0 EFLAGS: 00000803
RAX: ffffffff9023f100 RBX: ffff88802ef7ef18 RCX: ffffffff969be103
RDX: 00000000000000a2 RSI: 0000000000000000 RDI: ffff88802ef7ef18
RBP: ffffc90000007c30 R08: dffffc0000000000 R09: 0000000000000001
R10: fffffbfff1bfcf4e R11: 1ffffffff1bfcf4d R12: ffff88807dc40000
R13: 0000000000000000 R14: ffff88807dc40ad8 R15: 00000000000001e6
FS: 0000555584453500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa7edb5fa8 CR3: 0000000052696000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
__lock_task_sighand+0x146/0x2d0 kernel/signal.c:1411
lock_task_sighand include/linux/sched/signal.h:745 [inline]
do_send_sig_info kernel/signal.c:1300 [inline]
group_send_sig_info+0x1da/0x250 kernel/signal.c:1449
do_bpf_send_signal+0x7b/0x150 kernel/trace/bpf_trace.c:839
irq_work_single+0xd1/0x230 kernel/irq_work.c:211
irq_work_run_list kernel/irq_work.c:242 [inline]
irq_work_run+0x152/0x2e0 kernel/irq_work.c:251
__sysvec_irq_work+0xba/0x350 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x35/0x50 arch/x86/include/asm/apic.h:206
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 6f 38 f8 02 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc900055bfcb0 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: ffffffff8c3cfb78 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff52000ab7f85
R10: fffff52000ab7f85 R11: 1ffff92000ab7f84 R12: ffff8880b8e33e01
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000020
arch_irq_work_raise+0x82/0xd0 arch/x86/kernel/irq_work.c:31
irq_work_queue+0x95/0x140 kernel/irq_work.c:114
bpf_send_signal_common+0x2b2/0x420 kernel/trace/bpf_trace.c:878
____bpf_send_signal kernel/trace/bpf_trace.c:887 [inline]
bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:885
bpf_prog_7ba5217f62dcd359+0x38/0x3c
bpf_dispatcher_nop_func include/linux/bpf.h:1001 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
bpf_trace_run2+0x1cd/0x3b0 kernel/trace/bpf_trace.c:2323
__bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
trace_sys_enter+0x6b/0x80 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf0/0x150 kernel/entry/common.c:81
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:77
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f132e72ab39
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007ffd9445e880 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f132e9b5fa0 RCX: 00007f132e72ab39
RDX: 00007ffd9445e880 RSI: 00007ffd9445e9b0 RDI: 0000000000000011
RBP: 00007f132e9b5fa0 R08: 0000000000000002 R09: 00007ffd9445ef50
R10: 00007f132e9b5fa0 R11: 0000000000000246 R12: 00007f132e9b5fa0
R13: 00007f132e9b5fa0 R14: 0000000000000091 R15: 0000000000000003