INFO: task syz.6.663:8784 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc6-syzkaller-00036-gfbfd64d25c7a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.663       state:D stack:23792 pid:8784  tgid:8780  ppid:7132   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 d_wait_lookup fs/dcache.c:2477 [inline]
 d_alloc_parallel+0xc16/0x1600 fs/dcache.c:2559
 __lookup_slow+0x117/0x3f0 fs/namei.c:1776
 lookup_slow+0x53/0x70 fs/namei.c:1808
 walk_component fs/namei.c:2112 [inline]
 link_path_walk+0x99b/0xea0 fs/namei.c:2477
 path_openat+0x266/0x3590 fs/namei.c:3983
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_open fs/open.c:1425 [inline]
 __se_sys_open fs/open.c:1421 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1421
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea12785d29
RSP: 002b:00007fea1356e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fea12976080 RCX: 00007fea12785d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 00007fea12801b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fea12976080 R15: 00007fff191f6838
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/11:
1 lock held by rcu_exp_gp_kthr/19:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
2 locks held by kworker/u8:4/78:
2 locks held by getty/5581:
 #0: ffff888030a180a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.6.663/8781:
1 lock held by syz.6.663/8784:
 #0: ffff888054e5c180 (&type->i_mutex_dir_key#20){.+.+}-{4:4}, at: inode_lock_shared include/linux/fs.h:828 [inline]
 #0: ffff888054e5c180 (&type->i_mutex_dir_key#20){.+.+}-{4:4}, at: lookup_slow+0x45/0x70 fs/namei.c:1807
1 lock held by syz-executor/10296:
 #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
 #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
2 locks held by syz.0.1118/10656:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc6-syzkaller-00036-gfbfd64d25c7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8781 Comm: syz.6.663 Not tainted 6.13.0-rc6-syzkaller-00036-gfbfd64d25c7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:unwind_next_frame+0x1485/0x22d0
Code: 8d 58 80 48 8b 44 24 38 80 3c 28 00 74 08 4c 89 ff e8 cf 1b ba 00 49 89 1f 41 0f b6 04 2c 84 c0 0f 85 1d 0c 00 00 41 c6 06 00 <48> 8b 5c 24 40 e9 5b 01 00 00 48 89 ef 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc9000bc158d0 EFLAGS: 00000202
RAX: ffffc9000bc159f0 RBX: ffffc9000bc159d8 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000bc15a00
RBP: dffffc0000000000 R08: ffffc9000bc159ff R09: ffffc9000bc159f0
R10: dffffc0000000000 R11: fffff52001782b40 R12: ffffc9000bc18000
R13: ffffc9000bc159a0 R14: ffffffff81e14c25 R15: ffffc9000bc159f0
FS:  00007fea1358f6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea1dff8 CR3: 0000000022bdc000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4613 [inline]
 kmem_cache_free+0x195/0x410 mm/slub.c:4715
 free_buffer_head+0x54/0x240 fs/buffer.c:3031
 try_to_free_buffers+0x2fa/0x3b0 fs/buffer.c:2972
 shrink_folio_list+0x241e/0x5ca0 mm/vmscan.c:1440
 evict_folios+0x3c86/0x5800 mm/vmscan.c:4600
 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4796
 lru_gen_shrink_lruvec mm/vmscan.c:4945 [inline]
 shrink_lruvec+0x53c/0x3160 mm/vmscan.c:5700
 shrink_node_memcgs mm/vmscan.c:5936 [inline]
 shrink_node+0xb15/0x3e50 mm/vmscan.c:5977
 shrink_zones mm/vmscan.c:6222 [inline]
 do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6284
 try_to_free_mem_cgroup_pages+0x48c/0xab0 mm/vmscan.c:6616
 try_charge_memcg+0x8c7/0x1150 mm/memcontrol.c:2238
 try_charge mm/memcontrol-v1.h:19 [inline]
 charge_memcg+0x9f/0x170 mm/memcontrol.c:4497
 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:4512
 mem_cgroup_charge include/linux/memcontrol.h:646 [inline]
 filemap_add_folio+0xb7/0x380 mm/filemap.c:957
 do_read_cache_folio+0x349/0x5b0 mm/filemap.c:3784
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 dir_get_folio fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x16c/0x590 fs/sysv/dir.c:154
 sysv_inode_by_name+0x98/0x2a0 fs/sysv/dir.c:370
 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
 __lookup_slow+0x28e/0x3f0 fs/namei.c:1791
 lookup_slow+0x53/0x70 fs/namei.c:1808
 walk_component+0x2e1/0x410 fs/namei.c:2112
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2634
 filename_lookup+0x2a3/0x670 fs/namei.c:2663
 user_path_at+0x3a/0x60 fs/namei.c:3070
 do_mount fs/namespace.c:3850 [inline]
 __do_sys_mount fs/namespace.c:4063 [inline]
 __se_sys_mount+0x297/0x3c0 fs/namespace.c:4040
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea12785d29
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:00007fea1358f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fea12975fa0 RCX: 00007fea12785d29
RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000
RBP: 00007fea12801b08 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fea12975fa0 R15: 00007fff191f6838
 </TASK>
vkms_vblank_simulate: vblank timer overrun