INFO: task syz-executor.0:10682 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:23064 pid:10682 ppid: 1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4987 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6268
schedule+0xd2/0x260 kernel/sched/core.c:6341
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6400
__mutex_lock_common kernel/locking/mutex.c:680 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
blkdev_open+0x154/0x2e0 block/fops.c:501
do_dentry_open+0x4c8/0x1250 fs/open.c:822
do_open fs/namei.c:3426 [inline]
path_openat+0x1cad/0x2750 fs/namei.c:3559
do_filp_open+0x1aa/0x400 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
do_sys_open fs/open.c:1228 [inline]
__do_sys_openat fs/open.c:1244 [inline]
__se_sys_openat fs/open.c:1239 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1239
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: 0033:0x7f0f2b21ea04
RSP: 002b:00007ffcbe12e9b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffcbe12eab0 RCX: 00007f0f2b21ea04
RDX: 0000000000000002 RSI: 00007ffcbe12eaf0 RDI: 00000000ffffff9c
RBP: 00007ffcbe12eaf0 R08: 0000000000000000 R09: 00007ffcbe12e8c0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000008 R15: 00007ffcbe12eaf0
INFO: task systemd-udevd:12383 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-udevd state:D stack:26928 pid:12383 ppid: 2969 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:4987 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6268
schedule+0xd2/0x260 kernel/sched/core.c:6341
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
lo_release+0x160/0x1f0 drivers/block/loop.c:1768
blkdev_put_whole block/bdev.c:694 [inline]
blkdev_put+0x2fb/0x9e0 block/bdev.c:956
blkdev_close+0x6a/0x80 block/fops.c:515
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6afbbb9270
RSP: 002b:00007fff4c641508 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f6afbbb9270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f6afca73710 R08: 000055a86d3510d0 R09: 000055a86d350e00
R10: 00007f6afca738c0 R11: 0000000000000246 R12: 0000000000000000
R13: 000055a86d351d10 R14: 0000000000000003 R15: 000000000000000e
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by syz-executor.0/10682:
#0: ffff88801a8f8918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
2 locks held by systemd-udevd/12383:
#0: ffff88801a8f8918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801a8cc360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-next-20211118-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:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2968 Comm: systemd-journal Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:200
Code: 46 00 5d be 03 00 00 00 e9 c6 65 5f 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 f9 cb 8a 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9
RSP: 0018:ffffc90001a9f9e8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88807b2dba80 RSI: ffffffff81cd0d3f RDI: ffffc90001a9fc88
RBP: 00000003b480f646 R08: 0000000000000000 R09: ffff88801f228650
R10: ffffffff81cd0052 R11: 0000000000000000 R12: ffffc90001a9fc84
R13: d8b3ec18d94cd952 R14: ffffc90001a9fc48 R15: ffff888032dc0025
FS: 00007f810e40d8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f810b8f5000 CR3: 0000000022461000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
link_path_walk.part.0+0x619/0xd00 fs/namei.c:2307
link_path_walk fs/namei.c:2222 [inline]
path_openat+0x263/0x2750 fs/namei.c:3555
do_filp_open+0x1aa/0x400 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
do_sys_open fs/open.c:1228 [inline]
__do_sys_open fs/open.c:1236 [inline]
__se_sys_open fs/open.c:1232 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1232
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: 0033:0x7f810d99c840
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:00007ffca0ff3ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffca0ff3de0 RCX: 00007f810d99c840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000556215880fa0
RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000556215873040 R14: 00007ffca0ff3da0 R15: 0000556215881140
----------------
Code disassembly (best guess):
0: 46 00 5d be rex.RX add %r11b,-0x42(%rbp)
4: 03 00 add (%rax),%eax
6: 00 00 add %al,(%rax)
8: e9 c6 65 5f 02 jmpq 0x25f65d3
d: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
13: 48 8b be b0 01 00 00 mov 0x1b0(%rsi),%rdi
1a: e8 b4 ff ff ff callq 0xffffffd3
1f: 31 c0 xor %eax,%eax
21: c3 retq
22: 90 nop
23: 65 8b 05 f9 cb 8a 7e mov %gs:0x7e8acbf9(%rip),%eax # 0x7e8acc23
* 2a: 89 c1 mov %eax,%ecx <-- trapping instruction
2c: 48 8b 34 24 mov (%rsp),%rsi
30: 81 e1 00 01 00 00 and $0x100,%ecx
36: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx
3d: 02 00
3f: a9 .byte 0xa9