INFO: task syz-executor.1:6562 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.1 state:D stack:29032 pid: 6562 ppid: 8003 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
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
__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: 0023:0xf6f56549
RSP: 002b:00000000f452f5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000004c81
RDX: 0000000000000000 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:
2 locks held by kworker/u4:1/10:
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/6231:
#0: ffff88807bfc60f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by agetty/6246:
#0: ffff88807f001098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffffc90002acc2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 30104 Comm: kworker/u4:7 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy14 ieee80211_iface_work
RIP: 0010:__mod_timer+0xea/0xe30 kernel/time/timer.c:974
Code: 00 00 e8 19 fc 10 00 4c 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5d 0b 00 00 48 8b 45 08 <48> 85 c0 0f 84 93 02 00 00 e8 e8 fb 10 00 48 8d 45 10 48 89 c2 48
RSP: 0018:ffffc90004b2fa48 EFLAGS: 00000246
RAX: ffff8880267f9a68 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffff1100fa3b34e RSI: ffffffff81669bf7 RDI: 0000000000000003
RBP: ffff88807d1d9a68 R08: 0000000000000000 R09: ffffffff889419a1
R10: ffffffff81669bea R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88807d1d9868 R14: ffff88807d1d8c80 R15: ffff88807d1d9a70
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2a903d028 CR3: 000000007d619000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211_sta_merge_ibss net/mac80211/ibss.c:1295 [inline]
ieee80211_ibss_work+0x43f/0xe80 net/mac80211/ibss.c:1709
ieee80211_iface_work+0xb70/0xd00 net/mac80211/iface.c:1544
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: e8 19 fc 10 00 callq 0x10fc20
7: 4c 8d 7d 08 lea 0x8(%rbp),%r15
b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
12: fc ff df
15: 4c 89 fa mov %r15,%rdx
18: 48 c1 ea 03 shr $0x3,%rdx
1c: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
20: 0f 85 5d 0b 00 00 jne 0xb83
26: 48 8b 45 08 mov 0x8(%rbp),%rax
* 2a: 48 85 c0 test %rax,%rax <-- trapping instruction
2d: 0f 84 93 02 00 00 je 0x2c6
33: e8 e8 fb 10 00 callq 0x10fc20
38: 48 8d 45 10 lea 0x10(%rbp),%rax
3c: 48 89 c2 mov %rax,%rdx
3f: 48 rex.W