INFO: task syz-executor.4:30117 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:27088 pid:30117 ppid: 16378 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xb72/0x1460 kernel/sched/core.c:6253
schedule+0x12b/0x1f0 kernel/sched/core.c:6326
blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:178
del_gendisk+0x6d0/0x790 block/genhd.c:623
loop_remove drivers/block/loop.c:2080 [inline]
loop_control_remove drivers/block/loop.c:2137 [inline]
loop_control_ioctl+0x577/0x730 drivers/block/loop.c:2175
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4a4e93eae9
RSP: 002b:00007f4a4beb4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4a4ea51f60 RCX: 00007f4a4e93eae9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007f4a4e998f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd4091fdbf R14: 00007f4a4beb4300 R15: 0000000000022000
Showing all locks held in the system:
6 locks held by kworker/u4:0/8:
1 lock held by khungtaskd/27:
#0: ffffffff8cd1db00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by in:imklog/6222:
#0: ffff8880199cd4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990
2 locks held by agetty/6243:
#0: ffff88801a8bf098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90001d482e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113
=============================================
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:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc82/0xcd0 kernel/hung_task.c:295
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2957 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:__lock_acquire+0x1cc/0x2b00 kernel/locking/lockdep.c:4933
Code: b9 0a 76 0f 00 0f 84 c2 1a 00 00 8b 4d 20 48 c7 c0 00 db ae 8f 49 29 c6 49 c1 fe 06 48 ba ab aa aa aa aa aa aa aa 49 0f af d6 <41> 89 d6 85 db 4c 89 7c 24 28 48 89 9c 24 88 00 00 00 0f 84 45 01
RSP: 0018:ffffc90001d2f6c0 EFLAGS: 00000807
RAX: ffffffff8faedb00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000028 RSI: dffffc0000000000 RDI: ffff88807b1c9d00
RBP: ffffc90001d2f810 R08: 0000000000000000 R09: 0000000000000000
R10: fffffbfff1c3d216 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000078 R15: ffff88807b1ca758
FS: 00007f384e3f98c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f384b3ad000 CR3: 000000001b8e5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:268
rcu_read_lock include/linux/rcupdate.h:688 [inline]
mntput_no_expire+0xc3/0xfe0 fs/namespace.c:1163
path_put fs/namei.c:558 [inline]
terminate_walk+0x1ee/0x570 fs/namei.c:672
path_parentat fs/namei.c:2504 [inline]
filename_parentat+0x2be/0x7b0 fs/namei.c:2519
filename_create+0xf4/0x4e0 fs/namei.c:3637
do_mkdirat+0xae/0x530 fs/namei.c:3898
__do_sys_mkdir fs/namei.c:3929 [inline]
__se_sys_mkdir fs/namei.c:3927 [inline]
__x64_sys_mkdir+0x6a/0x80 fs/namei.c:3927
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f384d6b4687
Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fff9af8aeb8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fff9af8ddd0 RCX: 00007f384d6b4687
RDX: 00007f384e125a00 RSI: 00000000000001ed RDI: 0000558832b9f8a0
RBP: 00007fff9af8aef0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fff9af8ddd0 R15: 00007fff9af8b3e0
----------------
Code disassembly (best guess):
0: b9 0a 76 0f 00 mov $0xf760a,%ecx
5: 0f 84 c2 1a 00 00 je 0x1acd
b: 8b 4d 20 mov 0x20(%rbp),%ecx
e: 48 c7 c0 00 db ae 8f mov $0xffffffff8faedb00,%rax
15: 49 29 c6 sub %rax,%r14
18: 49 c1 fe 06 sar $0x6,%r14
1c: 48 ba ab aa aa aa aa movabs $0xaaaaaaaaaaaaaaab,%rdx
23: aa aa aa
26: 49 0f af d6 imul %r14,%rdx
* 2a: 41 89 d6 mov %edx,%r14d <-- trapping instruction
2d: 85 db test %ebx,%ebx
2f: 4c 89 7c 24 28 mov %r15,0x28(%rsp)
34: 48 89 9c 24 88 00 00 mov %rbx,0x88(%rsp)
3b: 00
3c: 0f .byte 0xf
3d: 84 45 01 test %al,0x1(%rbp)