INFO: task syz.3.1051:9214 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1051 state:D stack:23048 pid:9214 ppid:5774 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
perf_pending_task_sync kernel/events/core.c:5236 [inline]
_free_event+0x176/0xfb0 kernel/events/core.c:5242
put_event kernel/events/core.c:5370 [inline]
perf_event_release_kernel+0x7c8/0x850 kernel/events/core.c:5495
perf_release+0x3b/0x40 kernel/events/core.c:5505
__fput+0x221/0x930 fs/file_table.c:384
task_work_run+0x1d4/0x260 kernel/task_work.c:245
get_signal+0x11da/0x1390 kernel/signal.c:2679
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f478e39ce59
RSP: 002b:00007f478c5f5fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: fffffffffffffffc RBX: 00007f478e615fa0 RCX: 00007f478e39ce59
RDX: 0000200000000500 RSI: 00002000000004e0 RDI: 0000000040080000
RBP: 00007f478e432e6f R08: 0000200000000580 R09: 0000200000000580
R10: 0000200000000540 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f478e616038 R14: 00007f478e615fa0 R15: 00007fff159117e8
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5526:
#0: ffff88802d1c50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
2 locks held by kworker/u4:68/8573:
1 lock held by syz-executor/9498:
5 locks held by syz.0.1839/11431:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11431 Comm: syz.0.1839 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:enqueue_hrtimer+0x1/0x380 kernel/time/hrtimer.c:1099
Code: 5e 5d c3 66 0f 1f 44 00 00 f3 0f 1e fa e8 a7 d9 0f 00 bf aa 00 00 00 e9 8d 93 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 <41> 57 41 56 41 55 41 54 53 50 41 89 cf 89 d5 49 89 f6 48 89 fb 49
RSP: 0018:ffffc90000007d50 EFLAGS: 00000046
RAX: ffffffff8176e110 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880b8e2b7c0 RDI: ffff888030250d98
RBP: ffffc90000007eb8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f88 R12: ffff8880b8e2b7c0
R13: ffff888030250d98 R14: ffff8880b8e2b808 R15: dffffc0000000000
FS: 00007fcc72bab6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc71fee700 CR3: 000000002f67b000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1771 [inline]
__hrtimer_run_queues+0x62f/0xc10 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x30/0x90 kernel/kcov.c:313
Code: 04 24 65 48 8b 15 30 cf 7c 7e 65 8b 0d 31 cf 7c 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 74 52 <8b> 8a f8 15 00 00 83 f9 03 75 47 48 8b 8a 00 16 00 00 44 8b 8a fc
RSP: 0018:ffffc90004aff2f8 EFLAGS: 00000246
RAX: ffffffff813b2267 RBX: ffffc90004aff328 RCX: 0000000000000000
RDX: ffff888031275a00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888031275a00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000002 R12: ffffffff81508dc7
R13: 1ffff1100624ebee R14: dffffc0000000000 R15: ffffc90004aff328
unwind_done arch/x86/include/asm/unwind.h:50 [inline]
unwind_get_return_address+0x37/0xc0 arch/x86/kernel/unwind_orc.c:366
arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
release_pages+0x208a/0x2300 mm/swap.c:1022
tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:425
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3a0 kernel/fork.c:1357
copy_process+0x29c2/0x3df0 kernel/fork.c:2768
kernel_clone+0x24b/0x8a0 kernel/fork.c:2917
__do_sys_clone kernel/fork.c:3060 [inline]
__se_sys_clone kernel/fork.c:3044 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcc71d9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcc72baafd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fcc72015fa0 RCX: 00007fcc71d9ce59
RDX: 0000200000000240 RSI: 0000200000000200 RDI: 0000000088047080
RBP: 00007fcc71e32e6f R08: 0000200000000300 R09: 0000200000000300
R10: 00002000000002c0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fcc72016038 R14: 00007fcc72015fa0 R15: 00007ffe9d58d6b8