INFO: task syz.5.145:5184 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.145       state:D stack:27328 pid: 5184 ppid:  4574 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x1f2/0x450 fs/namei.c:3835
 do_mkdirat+0x9d/0x5a0 fs/namei.c:4080
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fddc5cd7ba9
RSP: 002b:00007fddc3efd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fddc5f1f180 RCX: 00007fddc5cd7ba9
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007fddc5d5ae19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fddc5f1f218 R14: 00007fddc5f1f180 R15: 00007ffed1449328
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3950:
 #0: ffff88802c0cf098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
2 locks held by syz-executor/4185:
 #0: ffff88801fd10518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
 #1: ffff88801fe4d468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xaa/0xb90 drivers/block/loop.c:1366
3 locks held by kworker/0:6/4252:
1 lock held by syz.5.145/5174:
1 lock held by syz.5.145/5180:
1 lock held by syz.5.145/5184:
 #0: ffff888061214188 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff888061214188 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3835
2 locks held by syz.2.618/7902:
2 locks held by syz.2.618/7904:
2 locks held by syz.2.618/7906:
5 locks held by syz.2.618/7908:
3 locks held by syz.2.618/7909:
2 locks held by syz.4.759/8549:
 #0: ffff8880756700e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x201/0x950 fs/super.c:229
 #1: ffffffff8c1b1f68 (lock#4){+.+.}-{3:3}, at: __lru_add_drain_all+0x68/0xac0 mm/swap.c:782
1 lock held by syz.2.758/8555:
 #0: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5180 Comm: syz.5.145 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:trace_irq_disable_rcuidle+0x8/0x180 include/trace/events/preemptirq.h:36
Code: f9 ff 81 e5 00 00 f0 00 74 08 e8 83 dd f9 ff 5b 5d c3 e8 7b dd f9 ff 48 89 df 31 f6 5b 5d eb 02 66 90 55 41 57 41 56 41 54 53 <48> 89 f3 49 89 fe e8 5d dd f9 ff 66 90 e8 56 dd f9 ff 5b 41 5c 41
RSP: 0018:ffffc90003a3e170 EFLAGS: 00000046
RAX: ffffffff817deda5 RBX: ffff88804d48b828 RCX: 0000000000080000
RDX: ffffc90016400000 RSI: 0000000000000000 RDI: ffffffff81bc3aa9
RBP: ffffc90003a3e238 R08: ffffffff89c000ca R09: 0000000000000003
R10: 00000000bfec15a1 R11: 0000000001c83102 R12: ffff88801754aa00
R13: ffff88804d48b828 R14: ffff88801754aa00 R15: 0000000000000286
FS:  00007fddc3f1e6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a223e0198 CR3: 0000000074d0d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kasan_quarantine_put+0x39/0x220 mm/kasan/quarantine.c:204
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0x8f/0x210 mm/slub.c:3520
 free_buffer_head+0x45/0xb0 fs/buffer.c:3327
 try_to_free_buffers+0x3b4/0x4e0 fs/buffer.c:3268
 shrink_page_list+0x24fe/0x6b60 mm/vmscan.c:1719
 shrink_inactive_list mm/vmscan.c:2223 [inline]
 shrink_list mm/vmscan.c:2450 [inline]
 shrink_lruvec+0x1170/0x24a0 mm/vmscan.c:2769
 shrink_node_memcgs mm/vmscan.c:2956 [inline]
 shrink_node+0x10a7/0x2610 mm/vmscan.c:3079
 shrink_zones mm/vmscan.c:3285 [inline]
 do_try_to_free_pages+0x5da/0x15c0 mm/vmscan.c:3340
 try_to_free_mem_cgroup_pages+0x2f6/0x780 mm/vmscan.c:3654
 try_charge_memcg+0x3de/0x14a0 mm/memcontrol.c:2654
 obj_cgroup_charge_pages+0x87/0x190 mm/memcontrol.c:3018
 obj_cgroup_charge+0x1a0/0x310 mm/memcontrol.c:3299
 memcg_slab_pre_alloc_hook mm/slab.h:287 [inline]
 slab_pre_alloc_hook+0x9f/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3139 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x3d/0x290 mm/slub.c:3238
 kmem_cache_zalloc include/linux/slab.h:725 [inline]
 alloc_buffer_head+0x21/0x100 fs/buffer.c:3311
 alloc_page_buffers+0x341/0x600 fs/buffer.c:832
 create_empty_buffers+0x3a/0x6d0 fs/buffer.c:1562
 create_page_buffers+0x1c4/0x320 fs/buffer.c:1679
 block_read_full_page+0xe5/0xd10 fs/buffer.c:2270
 do_read_cache_page+0x8a1/0x1030 mm/filemap.c:-1
 read_mapping_page include/linux/pagemap.h:515 [inline]
 dir_get_page fs/sysv/dir.c:58 [inline]
 sysv_find_entry+0x186/0x5e0 fs/sysv/dir.c:146
 sysv_inode_by_name+0x2f/0x310 fs/sysv/dir.c:360
 sysv_lookup+0x66/0xe0 fs/sysv/namei.c:38
 __lookup_slow+0x27d/0x3d0 fs/namei.c:1663
 lookup_slow+0x53/0x70 fs/namei.c:1680
 walk_component+0x319/0x460 fs/namei.c:1976
 link_path_walk+0x662/0xd40 fs/namei.c:-1
 path_openat+0x27d/0x2f30 fs/namei.c:3738
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x142/0x4a0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fddc5cd7ba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fddc3f1e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fddc5f1f090 RCX: 00007fddc5cd7ba9
RDX: 0000000000001002 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007fddc5d5ae19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fddc5f1f128 R14: 00007fddc5f1f090 R15: 00007ffed1449328
 </TASK>