INFO: task syz-executor.2:22451 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.2 state:D stack:27784 pid:22451 ppid: 21864 flags:0x00004004
Call Trace:
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
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa23e0baae9
RSP: 002b:00007fa23b5ee188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa23e1ce0e0 RCX: 00007fa23e0baae9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007fa23e114f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc7d58896f R14: 00007fa23b5ee300 R15: 0000000000022000
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
3 locks held by kworker/u4:2/49:
#0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
#1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x173/0x490 kernel/sched/psi.c:871
#2: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline]
#2: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: batadv_nc_worker+0xf3/0xfa0 net/batman-adv/network-coding.c:723
5 locks held by kworker/u4:4/982:
1 lock held by in:imklog/6218:
#0: ffff888079fe2d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
=============================================
NMI backtrace for cpu 1
CPU: 1 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:
__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
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2965 Comm: systemd-journal Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_preemption_disabled+0x3a/0x170 lib/smp_processor_id.c:56
Code: 44 00 00 65 44 8b 25 7d dc af 76 65 8b 1d ee 36 b0 76 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 <44> 89 e0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 44 00 00 9c 5b 81 e3 00
RSP: 0018:ffffc900027dfc88 EFLAGS: 00000002
RAX: ffffffffffffffff RBX: 0000000000000001 RCX: 1ffffffff1b228f9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8a051760 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e2bc8 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff89ac0c00 R14: ffff88807ecacb00 R15: 0000000000040560
FS: 00007f18302318c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f182db06000 CR3: 000000001b4c7000 CR4: 0000000000350ef0
Call Trace:
lockdep_hardirqs_on+0x79/0x100 kernel/locking/lockdep.c:4354
___slab_alloc+0xc41/0xfe0 mm/slub.c:2978
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3247
prepare_creds+0x3f/0x7b0 kernel/cred.c:260
access_override_creds fs/open.c:351 [inline]
do_faccessat+0x3f4/0x850 fs/open.c:415
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f182f4ec9c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe9e255c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffe9e258b40 RCX: 00007f182f4ec9c7
RDX: 00007f182ff5da00 RSI: 0000000000000000 RDI: 0000562d3ab229a3
RBP: 00007ffe9e255c60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffe9e258b40 R15: 00007ffe9e256150
----------------
Code disassembly (best guess):
0: 44 00 00 add %r8b,(%rax)
3: 65 44 8b 25 7d dc af mov %gs:0x76afdc7d(%rip),%r12d # 0x76afdc88
a: 76
b: 65 8b 1d ee 36 b0 76 mov %gs:0x76b036ee(%rip),%ebx # 0x76b03700
12: 81 e3 ff ff ff 7f and $0x7fffffff,%ebx
18: 31 ff xor %edi,%edi
1a: 89 de mov %ebx,%esi
1c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
21: 85 db test %ebx,%ebx
23: 74 11 je 0x36
25: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
* 2a: 44 89 e0 mov %r12d,%eax <-- trapping instruction
2d: 5b pop %rbx
2e: 5d pop %rbp
2f: 41 5c pop %r12
31: 41 5d pop %r13
33: 41 5e pop %r14
35: c3 retq
36: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3b: 9c pushfq
3c: 5b pop %rbx
3d: 81 .byte 0x81
3e: e3 00 jrcxz 0x40