INFO: task syz.4.5:5977 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5         state:D stack:27296 pid:5977  tgid:5942  ppid:5840   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5327 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6707
 __schedule_loop kernel/sched/core.c:6784 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6799
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6856
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1694
 inode_lock_nested include/linux/fs.h:852 [inline]
 filename_create+0x260/0x540 fs/namei.c:4080
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326
 __do_sys_mkdirat fs/namei.c:4349 [inline]
 __se_sys_mkdirat fs/namei.c:4347 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347
 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: 0033:0x7f9ee437cfb7
RSP: 002b:00007f9ee27d4e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f9ee27d4ef0 RCX: 00007f9ee437cfb7
RDX: 00000000000001ff RSI: 0000000020000180 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000180
R13: 00007f9ee27d4eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
INFO: task syz.4.5:5978 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5         state:D stack:27296 pid:5978  tgid:5942  ppid:5840   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5327 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6707
 __schedule_loop kernel/sched/core.c:6784 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6799
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6856
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1694
 inode_lock_nested include/linux/fs.h:852 [inline]
 filename_create+0x260/0x540 fs/namei.c:4080
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326
 __do_sys_mkdir fs/namei.c:4354 [inline]
 __se_sys_mkdir fs/namei.c:4352 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352
 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: 0033:0x7f9ee437e719
RSP: 002b:00007f9ee27b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f9ee4536130 RCX: 00007f9ee437e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007f9ee43f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ee4536130 R15: 00007fff47063f08
 </TASK>
INFO: task syz.4.5:5982 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5         state:D stack:27296 pid:5982  tgid:5942  ppid:5840   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5327 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6707
 __schedule_loop kernel/sched/core.c:6784 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6799
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6856
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1694
 inode_lock_nested include/linux/fs.h:852 [inline]
 filename_create+0x260/0x540 fs/namei.c:4080
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326
 __do_sys_mkdir fs/namei.c:4354 [inline]
 __se_sys_mkdir fs/namei.c:4352 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352
 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: 0033:0x7f9ee437e719
RSP: 002b:00007f9ee2591038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f9ee4536208 RCX: 00007f9ee437e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000340
RBP: 00007f9ee43f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9ee4536208 R15: 00007fff47063f08
 </TASK>
INFO: task syz.4.5:5985 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5         state:D stack:22520 pid:5985  tgid:5942  ppid:5840   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5327 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6707
 __schedule_loop kernel/sched/core.c:6784 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6799
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6856
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline]
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x705/0xa40 kernel/locking/rwsem.c:1526
 inode_lock_shared include/linux/fs.h:827 [inline]
 open_last_lookups fs/namei.c:3747 [inline]
 path_openat+0x88b/0x3590 fs/namei.c:3984
 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: 0033:0x7f9ee437e719
RSP: 002b:00007f9ee236e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f9ee45362e0 RCX: 00007f9ee437e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f9ee43f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ee45362e0 R15: 00007fff47063f08
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:1/12:
 #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffffc90000117d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90000117d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: ffffffff8fcc0790 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:587
 #3: ffffffff8fccd2e8 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x6af/0xcc0 net/core/net_namespace.c:623
1 lock held by khungtaskd/30:
 #0: ffffffff8e93c160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e93c160 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e93c160 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
3 locks held by kworker/u8:8/3016:
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffffc9000bfcfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc9000bfcfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: ffffffff8fccd2e8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
3 locks held by kworker/u8:9/3477:
1 lock held by klogd/5194:
2 locks held by getty/5586:
 #0: ffff888030efc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032432f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:6/5919:
1 lock held by syz.4.5/5943:
1 lock held by syz.4.5/5977:
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:852 [inline]
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: filename_create+0x260/0x540 fs/namei.c:4080
1 lock held by syz.4.5/5978:
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:852 [inline]
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: filename_create+0x260/0x540 fs/namei.c:4080
1 lock held by syz.4.5/5982:
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:852 [inline]
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: filename_create+0x260/0x540 fs/namei.c:4080
1 lock held by syz.4.5/5985:
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#13){.+.+}-{4:4}, at: inode_lock_shared include/linux/fs.h:827 [inline]
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#13){.+.+}-{4:4}, at: open_last_lookups fs/namei.c:3747 [inline]
 #0: ffff8880616e0180 (&type->i_mutex_dir_key#13){.+.+}-{4:4}, at: path_openat+0x88b/0x3590 fs/namei.c:3984
3 locks held by syz-executor/7789:
 #0: ffffffff8fccd2e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fccd2e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6796
 #1: ffffffff901c8690 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #1: ffffffff901c8690 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff901c8690 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:475
 #2: ffffffff8e7e6788 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock kernel/workqueue.c:5152 [inline]
 #2: ffffffff8e7e6788 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0xa55/0x1f20 kernel/workqueue.c:5706
2 locks held by sed/7847:
4 locks held by syz.6.390/7860:
5 locks held by syz.0.392/7859:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-next-20241106-syzkaller #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+0xffb/0x1040 kernel/hung_task.c:397
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5943 Comm: syz.4.5 Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:unwind_next_frame+0xba4/0x22d0
Code: df e8 d0 1c be 00 4c 8b 74 24 08 4d 8b 66 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 0f 85 67 12 00 00 <48> 8b 04 24 4c 8d 68 f8 41 83 3e 00 74 1c 4c 39 ed 77 17 4d 39 ec
RSP: 0018:ffffc900044a56b0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900044a57f0 RCX: 1ffff92000894afc
RDX: ffffffff90a13f6a RSI: 0000000000000002 RDI: ffffffff81420920
RBP: ffffc900044a0000 R08: 0000000000000003 R09: 0000000000000000
R10: ffffc900044a5830 R11: fffff52000894b08 R12: ffffc900044a8000
R13: ffffc900044a57e0 R14: ffffc900044a57e0 R15: 1ffff92000894afe
FS:  00007f9ee27f66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd730b64d8 CR3: 00000000223d6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24
 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:2338 [inline]
 slab_free mm/slub.c:4598 [inline]
 kmem_cache_free+0x195/0x410 mm/slub.c:4700
 free_buffer_head+0x54/0x240 fs/buffer.c:3031
 try_to_free_buffers+0x311/0x5f0 fs/buffer.c:2972
 shrink_folio_list+0x240c/0x8cc0 mm/vmscan.c:1433
 evict_folios+0x5568/0x7be0 mm/vmscan.c:4593
 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789
 lru_gen_shrink_lruvec mm/vmscan.c:4938 [inline]
 shrink_lruvec+0x541/0x31b0 mm/vmscan.c:5693
 shrink_node_memcgs mm/vmscan.c:5929 [inline]
 shrink_node+0xb1d/0x3e60 mm/vmscan.c:5970
 shrink_zones mm/vmscan.c:6215 [inline]
 do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277
 try_to_free_mem_cgroup_pages+0x48c/0xad0 mm/vmscan.c:6609
 try_charge_memcg+0x8c7/0x1150 mm/memcontrol.c:2234
 obj_cgroup_charge_pages+0x91/0x230 mm/memcontrol.c:2642
 obj_cgroup_charge+0x380/0x5d0 mm/memcontrol.c:2933
 __memcg_slab_post_alloc_hook+0x1b1/0x7e0 mm/memcontrol.c:2994
 memcg_slab_post_alloc_hook mm/slub.c:2152 [inline]
 slab_post_alloc_hook mm/slub.c:4114 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 kmem_cache_alloc_noprof+0x287/0x380 mm/slub.c:4160
 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3015
 folio_alloc_buffers+0x2bc/0x660 fs/buffer.c:924
 create_empty_buffers+0x3a/0x740 fs/buffer.c:1662
 block_read_full_folio+0x25c/0xcd0 fs/buffer.c:2377
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2366
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3826
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 dir_get_folio fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x16a/0x4b0 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_one_qstr_excl+0x11f/0x260 fs/namei.c:1692
 filename_create+0x297/0x540 fs/namei.c:4081
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326
 __do_sys_mkdir fs/namei.c:4354 [inline]
 __se_sys_mkdir fs/namei.c:4352 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352
 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: 0033:0x7f9ee437e719
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:00007f9ee27f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f9ee4535f80 RCX: 00007f9ee437e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f9ee43f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ee4535f80 R15: 00007fff47063f08
 </TASK>