INFO: task syz-executor.4:10861 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:26848 pid:10861 ppid: 7033 flags:0x20004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
del_gendisk+0x598/0x860 block/genhd.c:623
loop_remove+0x39/0xf0 drivers/block/loop.c:2080
loop_control_remove drivers/block/loop.c:2137 [inline]
loop_control_ioctl+0x445/0x4a0 drivers/block/loop.c:2175
__do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:972
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf6ea1549
RSP: 002b:00000000f449b5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000004c81
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6448:
#0: ffff88801fa62af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc1d/0xf50 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:check_preemption_disabled+0x2/0x170 lib/smp_processor_id.c:13
Code: 1f 44 00 00 e8 ef ea 49 f8 65 48 8b 3c 25 40 70 02 00 e8 51 f0 00 f8 eb 99 0f 1f 44 00 00 0f 0b e9 23 ff ff ff cc cc cc 41 56 <41> 55 49 89 f5 41 54 55 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 7d
RSP: 0018:ffffc90000cd78f0 EFLAGS: 00000286
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815cfc31
RDX: fffffbfff1b22e6b RSI: ffffffff8a0516e0 RDI: ffffffff8a051720
RBP: 1ffff9200019af27 R08: 0000000000000000 R09: ffffffff8d917357
R10: fffffbfff1b22e6a R11: 000000000000003f R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000824 R15: ffffffff8bcb0500
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84b7428000 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:330 [inline]
rcu_is_watching+0xe/0xb0 kernel/rcu/tree.c:1121
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_sched_held+0x1c/0x70 kernel/rcu/update.c:123
trace_lock_release include/trace/events/lock.h:58 [inline]
lock_release+0x522/0x720 kernel/locking/lockdep.c:5648
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:389 [inline]
__text_poke+0x5d4/0x8c0 arch/x86/kernel/alternative.c:1059
text_poke_bp_batch+0x187/0x560 arch/x86/kernel/alternative.c:1294
text_poke_flush arch/x86/kernel/alternative.c:1451 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1448 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
toggle_allocation_gate mm/kfence/core.c:746 [inline]
toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:724
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 44 00 00 add %r8b,(%rax)
3: e8 ef ea 49 f8 callq 0xf849eaf7
8: 65 48 8b 3c 25 40 70 mov %gs:0x27040,%rdi
f: 02 00
11: e8 51 f0 00 f8 callq 0xf800f067
16: eb 99 jmp 0xffffffb1
18: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1d: 0f 0b ud2
1f: e9 23 ff ff ff jmpq 0xffffff47
24: cc int3
25: cc int3
26: cc int3
27: 41 56 push %r14
* 29: 41 55 push %r13 <-- trapping instruction
2b: 49 89 f5 mov %rsi,%r13
2e: 41 54 push %r12
30: 55 push %rbp
31: 48 89 fd mov %rdi,%rbp
34: 53 push %rbx
35: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3a: 65 gs
3b: 44 rex.R
3c: 8b .byte 0x8b
3d: 25 .byte 0x25
3e: 7d .byte 0x7d