INFO: task syz.0.16:5055 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.16        state:D stack:28208 pid: 5055 ppid:  4815 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
 d_wait_lookup+0x18b/0x250 fs/dcache.c:2569
 d_alloc_parallel+0xa01/0x12d0 fs/dcache.c:2651
 __lookup_slow+0x113/0x3d0 fs/namei.c:1648
 lookup_slow+0x53/0x70 fs/namei.c:1680
 walk_component+0x319/0x460 fs/namei.c:1976
 lookup_last fs/namei.c:2431 [inline]
 path_lookupat+0x169/0x440 fs/namei.c:2455
 filename_lookup+0x1e2/0x4f0 fs/namei.c:2484
 user_path_at_empty+0x40/0x190 fs/namei.c:2883
 user_path_at include/linux/namei.h:57 [inline]
 do_faccessat+0x3f3/0xa50 fs/open.c:422
 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: 0033:0x7f3f1202a929
RSP: 002b:00007f3f11279038 EFLAGS: 00000246 ORIG_RAX: 000000000000010d
RAX: ffffffffffffffda RBX: 00007f3f12252080 RCX: 00007f3f1202a929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f3f120acb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f3f12252080 R15: 00007ffd9e4537c8
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/0:0/7:
 #0: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #1: ffff8880b9027888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4d6/0x810 kernel/sched/psi.c:891
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by kswapd0/254:
2 locks held by getty/3955:
 #0: ffff88802c5d3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
2 locks held by syz.0.16/5054:
1 lock held by syz.0.16/5055:
 #0: ffff88806ffb8188 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88806ffb8188 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
1 lock held by syz.1.17/5078:
1 lock held by syz.1.17/5079:
 #0: ffff88806ffb86d0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88806ffb86d0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
1 lock held by syz.2.18/5101:
1 lock held by syz.2.18/5102:
 #0: ffff88804e718188 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88804e718188 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
2 locks held by syz.3.19/5129:
1 lock held by syz.3.19/5130:
 #0: ffff88806ffb8c18 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88806ffb8c18 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
1 lock held by syz.4.20/5158:
 #0: ffff88806ffb9160 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88806ffb9160 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: open_last_lookups fs/namei.c:3531 [inline]
 #0: ffff88806ffb9160 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: path_openat+0x7e4/0x2f30 fs/namei.c:3739
1 lock held by syz.4.20/5159:
1 lock held by syz.5.21/5189:
1 lock held by syz.5.21/5190:
 #0: ffff88806ffb96a8 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88806ffb96a8 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
2 locks held by syz.6.22/5226:
1 lock held by syz.6.22/5227:
 #0: ffff88804e7186d0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88804e7186d0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
1 lock held by syz.7.23/5257:
1 lock held by syz.7.23/5258:
 #0: ffff88804e718c18 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
 #0: ffff88804e718c18 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5189 Comm: syz.5.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:memcg_rstat_updated mm/memcontrol.c:663 [inline]
RIP: 0010:__mod_memcg_lruvec_state+0x11e/0x190 mm/memcontrol.c:746
Code: 89 f7 89 c6 e8 d3 27 b1 ff 48 c7 c7 00 d6 15 8a e8 67 dc e8 07 8b 4c 24 04 89 c8 f7 d8 0f 48 c1 89 c3 65 0f c1 1d 2a 01 43 7e <01> c3 83 fb 21 72 32 c1 eb 05 48 c7 c7 20 89 12 96 be 04 00 00 00
RSP: 0018:ffffc9000375e388 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00000000ffffffff
RDX: 0000000000000000 RSI: ffffffff8a15d600 RDI: ffffffff8a59a4c0
RBP: 0000000000000013 R08: dffffc0000000000 R09: fffff940004bf811
R10: fffff940004bf811 R11: 1ffffd40004bf810 R12: 0000000000000013
R13: ffffffffffffffff R14: ffff888022428000 R15: ffff88807cc820c8
FS:  00007fb262bea6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cdec9bca38 CR3: 000000005dea4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mod_lruvec_state mm/memcontrol.c:767 [inline]
 __mod_lruvec_page_state+0x1b6/0x330 mm/memcontrol.c:788
 unaccount_page_cache_page+0x299/0x870 mm/filemap.c:196
 __delete_from_page_cache+0xbf/0x6b0 mm/filemap.c:231
 __remove_mapping+0x832/0x9f0 mm/vmscan.c:1181
 shrink_page_list+0x30f1/0x6b60 mm/vmscan.c:1753
 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_open fs/namei.c:3440 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0x1003/0x2f30 fs/namei.c:3739
 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: 0033:0x7fb26397a929
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:00007fb262bea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb263ba1fa0 RCX: 00007fb26397a929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007fb2639fcb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb263ba1fa0 R15: 00007ffcafd94058
 </TASK>