INFO: task syz-executor.4:790 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:28120 pid: 790 ppid: 8441 flags:0x20004004
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
loop_set_status+0x440/0x930 drivers/block/loop.c:1264
loop_set_status_compat+0xac/0x100 drivers/block/loop.c:1674
lo_compat_ioctl+0xeb/0x110 drivers/block/loop.c:1700
compat_blkdev_ioctl+0x3b8/0x810 block/ioctl.c:674
__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: 0023:0xf6eae549
RSP: 002b:00000000f44875fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000004c02
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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/6227:
#0: ffff8880721a9c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by agetty/6244:
#0: ffff888022c61098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffffc900030132e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
3 locks held by kworker/u4:2/14468:
6 locks held by kworker/u4:3/23970:
#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+0x3a6/0x490 kernel/sched/psi.c:880
#2: ffff8880b9c28298 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x60c/0xe30 kernel/time/timer.c:1043
#3: ffffffff906f9e70 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:661
#4: ffffffff8ba4d6a8 (text_mutex){+.+.}-{3:3}, at: arch_jump_label_transform_apply+0xe/0x20 arch/x86/kernel/jump_label.c:145
#5: ffffffff8bba2f08 (tk_core.seq.seqcount){----}-{0:0}, at: clockevents_program_event+0x141/0x370 kernel/time/clockevents.c:326
1 lock held by syz-executor.4/790:
#0: ffff88801a510b60 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248
2 locks held by systemd-udevd/784:
#0: ffff88801a515118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
#1: ffff88801a510b60 (&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 5.16.0-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 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: 2970 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:number+0x72f/0xae0 lib/vsprintf.c:556
Code: 84 c0 0f 85 e5 02 00 00 4c 89 e0 4c 89 e1 41 0f b6 55 00 48 bf 00 00 00 00 00 fc ff df 48 c1 e8 03 83 e1 07 0f b6 04 38 38 c8 <7f> 08 84 c0 0f 85 3f 03 00 00 41 88 14 24 e8 4e 9c 77 fd 83 ed 01
RSP: 0018:ffffc9000204f9a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000fffffff2 RCX: 0000000000000000
RDX: 0000000000000035 RSI: 0000000000000001 RDI: dffffc0000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff83fffbd6 R11: 0000000000000000 R12: ffff88807a340108
R13: ffffc9000204fa39 R14: ffff88807a3420f8 R15: ffff88807a340100
FS: 00007f9ff729b8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ff4064000 CR3: 000000007a4d4000 CR4: 00000000003506f0
DR0: 000000004310b3c9 DR1: 0000000000002800 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vsnprintf+0xf09/0x14f0 lib/vsprintf.c:2871
vscnprintf lib/vsprintf.c:2908 [inline]
scnprintf+0xbb/0x140 lib/vsprintf.c:2962
info_print_ext_header.constprop.0+0x1eb/0x280 kernel/printk/printk.c:567
devkmsg_read+0x3c9/0x730 kernel/printk/printk.c:749
vfs_read+0x1b5/0x600 fs/read_write.c:479
ksys_read+0x12d/0x250 fs/read_write.c:619
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: 0033:0x7f9ff682a210
Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24
RSP: 002b:00007ffe12834088 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ffe12836b00 RCX: 00007f9ff682a210
RDX: 0000000000002000 RSI: 00007ffe12834900 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000008 R09: 00007ffe12868080
R10: 00007ffe128680f0 R11: 0000000000000246 R12: 00007ffe12834900
R13: 00007ffe12836a58 R14: 000055b46bb38958 R15: 0005d126946ab0ad
----------------
Code disassembly (best guess):
0: 84 c0 test %al,%al
2: 0f 85 e5 02 00 00 jne 0x2ed
8: 4c 89 e0 mov %r12,%rax
b: 4c 89 e1 mov %r12,%rcx
e: 41 0f b6 55 00 movzbl 0x0(%r13),%edx
13: 48 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%rdi
1a: fc ff df
1d: 48 c1 e8 03 shr $0x3,%rax
21: 83 e1 07 and $0x7,%ecx
24: 0f b6 04 38 movzbl (%rax,%rdi,1),%eax
28: 38 c8 cmp %cl,%al
* 2a: 7f 08 jg 0x34 <-- trapping instruction
2c: 84 c0 test %al,%al
2e: 0f 85 3f 03 00 00 jne 0x373
34: 41 88 14 24 mov %dl,(%r12)
38: e8 4e 9c 77 fd callq 0xfd779c8b
3d: 83 ed 01 sub $0x1,%ebp