INFO: task syz-executor.0:21061 blocked for more than 143 seconds.
Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:27928 pid:21061 ppid: 6558 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4969 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6250
schedule+0xd2/0x260 kernel/sched/core.c:6323
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
loop_set_status+0x17d/0x930 drivers/block/loop.c:1264
loop_set_status_old+0x148/0x1b0 drivers/block/loop.c:1396
lo_ioctl+0x3e9/0x17c0 drivers/block/loop.c:1566
blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
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: 0033:0x7fc41eea0ae9
RSP: 002b:00007fc41c416188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc41efb3f60 RCX: 00007fc41eea0ae9
RDX: 0000000020000780 RSI: 0000000000004c02 RDI: 0000000000000004
RBP: 00007fc41eefaf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc41f4e7b2f R14: 00007fc41c416300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6221:
#0: ffff88801bfab9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
1 lock held by syz-executor.0/21061:
#0: ffff88801a485360 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248
2 locks held by systemd-udevd/21072:
#0: ffff88801a500918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
#1: ffff88801a485360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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: 2963 Comm: systemd-journal Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_read_lock_sched_notrace include/linux/rcupdate.h:788 [inline]
RIP: 0010:trace_user_exit.constprop.0+0x144/0x220 include/trace/events/context_tracking.h:48
Code: 66 7e 0f 94 c3 31 ff 89 de e8 28 c9 db ff 84 db 0f 84 dd fe ff ff e8 3b c5 db ff 0f 1f 44 00 00 e9 ce fe ff ff e8 2c c5 db ff <65> ff 05 35 4e 66 7e 48 8b 05 ae 46 e1 0b e8 99 ad c6 ff 31 ff 89
RSP: 0018:ffffc90001d7ff00 EFLAGS: 00000093
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88807b6fd700 RSI: ffffffff819c21c4 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff819c20e2 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f014054a8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f013db7f000 CR3: 000000007f0c7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__context_tracking_exit+0xbd/0xe0 kernel/context_tracking.c:161
user_exit_irqoff include/linux/context_tracking.h:47 [inline]
__enter_from_user_mode kernel/entry/common.c:22 [inline]
syscall_enter_from_user_mode+0x4c/0x70 kernel/entry/common.c:104
do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f013fad9840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffc716621f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffc71662500 RCX: 00007f013fad9840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000564e34535cb0
RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000564e34529040 R14: 00007ffc716624c0 R15: 0000564e34535ad0
----------------
Code disassembly (best guess):
0: 66 7e 0f data16 jle 0x12
3: 94 xchg %eax,%esp
4: c3 retq
5: 31 ff xor %edi,%edi
7: 89 de mov %ebx,%esi
9: e8 28 c9 db ff callq 0xffdbc936
e: 84 db test %bl,%bl
10: 0f 84 dd fe ff ff je 0xfffffef3
16: e8 3b c5 db ff callq 0xffdbc556
1b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
20: e9 ce fe ff ff jmpq 0xfffffef3
25: e8 2c c5 db ff callq 0xffdbc556
* 2a: 65 ff 05 35 4e 66 7e incl %gs:0x7e664e35(%rip) # 0x7e664e66 <-- trapping instruction
31: 48 8b 05 ae 46 e1 0b mov 0xbe146ae(%rip),%rax # 0xbe146e6
38: e8 99 ad c6 ff callq 0xffc6add6
3d: 31 ff xor %edi,%edi
3f: 89 .byte 0x89