INFO: task syz-executor558:3629 blocked for more than 143 seconds.
Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor558 state:D stack:26896 pid: 3629 ppid: 3626 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5073 [inline]
__schedule+0x937/0x1090 kernel/sched/core.c:6382
schedule+0xeb/0x1b0 kernel/sched/core.c:6454
blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:179
nbd_add_socket+0x17b/0x8e0 drivers/block/nbd.c:1109
__nbd_ioctl drivers/block/nbd.c:1454 [inline]
nbd_ioctl+0x263/0xb80 drivers/block/nbd.c:1511
blkdev_ioctl+0x3a6/0x780 block/ioctl.c:588
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe94e1c73e9
RSP: 002b:00007fff230e7bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000074e0a RCX: 00007fe94e1c73e9
RDX: 0000000000000005 RSI: 000000000000ab00 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007fff230e7d98 R09: 00007fff230e7d98
R10: 00007fff230e7d98 R11: 0000000000000246 R12: 00007fff230e7c0c
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8cd1cd60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by klogd/2955:
#0: ffff8880b9b39bd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:554
2 locks held by getty/3280:
#0: ffff88814bfb8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc90002e732e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c2/0x1c60 drivers/tty/n_tty.c:2075
1 lock held by udevd/3628:
#0: ffff88801c8a0918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf8/0x7a0 block/bdev.c:905
1 lock held by syz-executor558/3629:
#0: ffff88801c775998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316 #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:111
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:212 [inline]
watchdog+0xc82/0xcd0 kernel/hung_task.c:369
kthread+0x2a3/0x2d0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 975 Comm: kworker/u4:4 Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:validate_chain+0xfe/0x8250 kernel/locking/lockdep.c:3770
Code: 48 8d 5e 20 48 89 d8 48 c1 e8 03 48 89 44 24 58 42 8a 04 20 84 c0 0f 85 de 09 00 00 48 89 5c 24 10 8b 1b 89 d8 25 00 80 04 00 <3d> 00 00 04 00 0f 85 e9 04 00 00 81 e3 ff 1f 00 00 48 89 d8 48 c1
RSP: 0018:ffffc90004967180 EFLAGS: 00000006
RAX: 0000000000040000 RBX: 000000000004008f RCX: 74d2cd9d99b1225f
RDX: 0000000000000000 RSI: ffff88801deae228 RDI: ffff88801dead700
RBP: ffffc90004967490 R08: dffffc0000000000 R09: fffffbfff1f86d83
R10: fffffbfff1f86d83 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff9200092ce50 R14: 74d2cd9d99b1225f R15: 74d2cd9d99b1225f
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c1909809e8 CR3: 000000000ca8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5029
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5641
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:349 [inline]
__get_locked_pte+0x2ad/0x390 mm/memory.c:1752
get_locked_pte include/linux/mm.h:2128 [inline]
__text_poke+0x280/0x9f0 arch/x86/kernel/alternative.c:1038
text_poke arch/x86/kernel/alternative.c:1121 [inline]
text_poke_bp_batch+0x680/0x920 arch/x86/kernel/alternative.c:1436
text_poke_flush arch/x86/kernel/alternative.c:1542 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1549
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x12d/0x250 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate+0xbf/0x460 mm/kfence/core.c:785
process_one_work+0x83c/0x11a0 kernel/workqueue.c:2289
worker_thread+0xa6c/0x1290 kernel/workqueue.c:2436
kthread+0x2a3/0x2d0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.168 msecs
----------------
Code disassembly (best guess):
0: 48 8d 5e 20 lea 0x20(%rsi),%rbx
4: 48 89 d8 mov %rbx,%rax
7: 48 c1 e8 03 shr $0x3,%rax
b: 48 89 44 24 58 mov %rax,0x58(%rsp)
10: 42 8a 04 20 mov (%rax,%r12,1),%al
14: 84 c0 test %al,%al
16: 0f 85 de 09 00 00 jne 0x9fa
1c: 48 89 5c 24 10 mov %rbx,0x10(%rsp)
21: 8b 1b mov (%rbx),%ebx
23: 89 d8 mov %ebx,%eax
25: 25 00 80 04 00 and $0x48000,%eax
* 2a: 3d 00 00 04 00 cmp $0x40000,%eax <-- trapping instruction
2f: 0f 85 e9 04 00 00 jne 0x51e
35: 81 e3 ff 1f 00 00 and $0x1fff,%ebx
3b: 48 89 d8 mov %rbx,%rax
3e: 48 rex.W
3f: c1 .byte 0xc1