INFO: task syz.3.889:8541 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.889       state:D stack:27912 pid:8541  ppid:5776   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
 blkdev_get_by_dev+0x121/0x600 block/bdev.c:805
 blkdev_open+0x152/0x360 block/fops.c:589
 do_dentry_open+0x8c6/0x1500 fs/open.c:929
 do_open fs/namei.c:3640 [inline]
 path_openat+0x274b/0x3190 fs/namei.c:3797
 do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1421
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1447
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0221b8df90
RSP: 002b:00007f02229eeb70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000044581 RCX: 00007f0221b8df90
RDX: 0000000000044581 RSI: 00007f02229eec10 RDI: 00000000ffffff9c
RBP: 00007f02229eec10 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007f0221de6038 R14: 00007f0221de5fa0 R15: 00007ffcd058dff8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
3 locks held by kworker/u4:4/58:
2 locks held by getty/5532:
 #0: ffff8880316190a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by udevd/5917:
 #0: ffff888021ac54c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x121/0x600 block/bdev.c:805
2 locks held by kworker/1:11/7101:
 #0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
 #0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
 #1: ffffc9000bbafd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
 #1: ffffc9000bbafd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
5 locks held by kworker/u4:20/8375:
1 lock held by syz.3.889/8541:
 #0: ffff888021ac54c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x121/0x600 block/bdev.c:805
5 locks held by syz.5.1940/11520:
 #0: ffff888148c8f4a8 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: freeze_bdev+0x31/0x230 block/bdev.c:243
 #1: ffff88804cc70418 (sb_writers#4){++++}-{0:0}, at: sb_wait_write fs/super.c:1860 [inline]
 #1: ffff88804cc70418 (sb_writers#4){++++}-{0:0}, at: freeze_super+0x4c4/0x970 fs/super.c:2007
 #2: ffff88804cc700e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #2: ffff88804cc700e0 (&type->s_umount_key#31){++++}-{3:3}, at: super_lock+0x11a/0x360 fs/super.c:117
 #3: ffff88804cc70510 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1860 [inline]
 #3: ffff88804cc70510 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x5c3/0x970 fs/super.c:2013
 #4: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
 #4: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x448/0x830 kernel/rcu/tree_exp.h:1004

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf41/0xf80 kernel/hung_task.c:379
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5771 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_raw_spin_lock_bh+0x0/0x50 kernel/locking/spinlock.c:177
Code: 45 4b c7 04 3e 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 50 75 0b 48 8d 65 e8 5b 41 5e 41 5f 5d c3 e8 a1 5c f6 ff 90 <f3> 0f 1e fa 41 56 53 48 89 fb 4c 8b 74 24 10 4c 89 f7 be 01 02 00
RSP: 0018:ffffc900045e7a00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880225b4a18 RCX: 3a317b13e5803900
RDX: ffff8880296b5a00 RSI: ffffffff8aaace60 RDI: ffff8880225b4a18
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff21b28b8
R10: dffffc0000000000 R11: fffffbfff21b28b9 R12: dffffc0000000000
R13: 00007ffedb1058cc R14: ffff8880225b4980 R15: 0000000000000040
FS:  00005555947a5500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4011b7f18 CR3: 0000000061cfe000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x6a/0x100 net/core/sock.c:3538
 do_ip_getsockopt+0xb56/0x1800 net/ipv4/ip_sockglue.c:1601
 ip_getsockopt+0xbc/0x210 net/ipv4/ip_sockglue.c:1773
 do_sock_getsockopt+0x368/0x440 net/socket.c:2384
 __sys_getsockopt net/socket.c:2413 [inline]
 __do_sys_getsockopt net/socket.c:2423 [inline]
 __se_sys_getsockopt net/socket.c:2420 [inline]
 __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2420
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe400f9148a
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffedb1058a8 EFLAGS: 00000242 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffedb1058d0 RCX: 00007fe400f9148a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffedb1058cc R09: 00007ffedb105ce7
R10: 00007ffedb1058d0 R11: 0000000000000242 R12: 00007fe4011b8520
R13: 00007ffedb1058cc R14: 0000000000000000 R15: 00007fe4011ba020
 </TASK>