INFO: task syz.3.2137:13179 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2137 state:D stack:28664 pid:13179 tgid:13157 ppid:5641 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
blk_debugfs_lock_nomemsave block/blk.h:787 [inline]
blk_trace_remove kernel/trace/blktrace.c:561 [inline]
blk_trace_ioctl+0x39a/0x910 kernel/trace/blktrace.c:952
blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:717
blkdev_ioctl+0x528/0x740 block/ioctl.c:791
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6bf79de59
RSP: 002b:00007fd6c0635028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd6bfa26090 RCX: 00007fd6bf79de59
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000008
RBP: 00007fd6bf833e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd6bfa26128 R14: 00007fd6bfa26090 R15: 00007fd6bfb4fa48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by klogd/4982:
1 lock held by udevd/4993:
4 locks held by dhcpcd/5287:
1 lock held by crond/5363:
2 locks held by getty/5380:
#0: ffff8880366d80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5611:
3 locks held by udevd/5635:
3 locks held by udevd/5636:
6 locks held by kworker/u9:7/5637:
#0: ffff88807eacc940 ((wq_completion)hci5){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88807eacc940 ((wq_completion)hci5){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90004097c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90004097c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffff8881494d8ea0 (
&hdev->req_lock
){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1cb/0x3f0 net/bluetooth/hci_sync.c:331
#3: ffff8881494d80b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0xa6f/0x1190 net/bluetooth/hci_sync.c:5786
#4: ffffffff8ec848e0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4402 [inline]
#4: ffffffff8ec848e0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310 mm/page_alloc.c:4427
#5: ffff8880b8624440 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x57/0x7d0 kernel/sched/psi.c:933
3 locks held by syz-executor/5644:
3 locks held by syz.3.2137/13158:
1 lock held by syz.3.2137/13179:
#0: ffff888026c01b48 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:787 [inline]
#0: ffff888026c01b48 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:561 [inline]
#0: ffff888026c01b48 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x39a/0x910 kernel/trace/blktrace.c:952
1 lock held by syz.7.2319/13801:
3 locks held by syz-executor/13977:
3 locks held by syz.1.2529/14569:
2 locks held by syz-executor/14571:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5363 Comm: crond Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:mark_lock+0xd/0x190 kernel/locking/lockdep.c:4722
Code: 2c 24 e9 b6 fd ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 8b 46 20 <89> c1 81 e1 00 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08
RSP: 0000:ffffc90000007520 EFLAGS: 00000046
RAX: 00000000000a2007 RBX: ffff88802db42bb0 RCX: 0000000000000006
RDX: 0000000000000008 RSI: ffff88802db42b90 RDI: ffff88802db41f00
RBP: 0000000000000000 R08: ffffffff8176f27f R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: 0000000000000002
R13: ffff88802db42b90 R14: ffff88802db41f00 R15: 0000000000000006
FS: 00007f28eea63c80(0000) GS:ffff888124f56000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa51343b60 CR3: 00000000769c0000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4674 [inline]
__lock_acquire+0x683/0x2cf0 kernel/locking/lockdep.c:5191
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:840 [inline]
class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
insert_work+0x3d/0x330 kernel/workqueue.c:2226
__queue_work+0xba0/0x10a0 kernel/workqueue.c:2405
call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1794 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x67e/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x225/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca 56 d0 f5 48 89 df e8 22 cc d0 f5 e8 1d ae fc f5 fb bf 01 00 00 00 42 e2 c1 f5 65 8b 05 3b a2 9a 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0000:ffffc900036a6710 EFLAGS: 00000206
RAX: 0000000000062b71 RBX: ffff888140450098 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8e22b72d RDI: 0000000000000001
RBP: ffffc900036a6970 R08: ffffffff905781f7 R09: 1ffffffff20af03e
R10: dffffc0000000000 R11: fffffbfff20af03f R12: 000000000000003b
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900036a67e0
spin_unlock_irq include/linux/spinlock.h:402 [inline]
lruvec_unlock_irq include/linux/memcontrol.h:1483 [inline]
move_folios_to_lru+0x103e/0x1310 mm/vmscan.c:1924
evict_folios+0x4215/0x4b40 mm/vmscan.c:4865
try_to_shrink_lruvec+0xb4f/0xed0 mm/vmscan.c:4983
shrink_one+0x233/0x730 mm/vmscan.c:5024
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x3303/0x3b60 mm/vmscan.c:6154
shrink_zones mm/vmscan.c:6410 [inline]
do_try_to_free_pages+0x6a3/0x1990 mm/vmscan.c:6472
try_to_free_pages+0x90a/0xe50 mm/vmscan.c:6711
__perform_reclaim mm/page_alloc.c:4405 [inline]
__alloc_pages_direct_reclaim+0x148/0x310 mm/page_alloc.c:4427
__alloc_pages_slowpath+0x59d/0xcc0 mm/page_alloc.c:4876
__alloc_frozen_pages_noprof+0x31f/0x380 mm/page_alloc.c:5317
alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490
alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline]
alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581
folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591
filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013
__filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2012
__filemap_get_folio include/linux/pagemap.h:761 [inline]
filemap_fault+0xa84/0x13b0 mm/filemap.c:3592
__do_fault+0x138/0x2a0 mm/memory.c:5425
do_read_fault mm/memory.c:5860 [inline]
do_fault mm/memory.c:5994 [inline]
do_pte_missing+0x2215/0x34b0 mm/memory.c:4566
handle_pte_fault mm/memory.c:6379 [inline]
__handle_mm_fault mm/memory.c:6517 [inline]
handle_mm_fault+0x1b36/0x3080 mm/memory.c:6686
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f28eebb3407
Code: Unable to access opcode bytes at 0x7f28eebb33dd.
RSP: 002b:00007fff57f29c70 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007f28eea63c80 RCX: 00007f28eebb3407
RDX: 00007fff57f29cb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff57f29cb0 R11: 0000000000000202 R12: 0000000000000000
R13: 000000000000003c R14: 0000000000000000 R15: 0000000000000035