INFO: task syz-executor.5:12360 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc1-next-20230912-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:30176 pid:12360 ppid:5074   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830
 rwsem_down_read_slowpath+0x625/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0xf0/0x470 kernel/locking/rwsem.c:1522
 inode_lock_shared include/linux/fs.h:812 [inline]
 lookup_slow fs/namei.c:1709 [inline]
 walk_component+0x33b/0x5a0 fs/namei.c:2001
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x17f/0x770 fs/namei.c:2482
 filename_lookup+0x1e7/0x5b0 fs/namei.c:2511
 user_path_at_empty+0x42/0x60 fs/namei.c:2910
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3672 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __x64_sys_mount+0x1ff/0x310 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd124c7cae9
RSP: 002b:00007fd1259a40c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd124d9c050 RCX: 00007fd124c7cae9
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 00007fd124cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fd124d9c050 R15: 00007fffddd36668
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.6.0-rc1-next-20230912-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xfac/0x1230 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: kworker/u4:2 Not tainted 6.6.0-rc1-next-20230912-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:unwind_get_return_address+0xa1/0xe0 arch/x86/kernel/unwind_orc.c:369
Code: 00 31 ff 89 c5 89 c6 e8 7d 9d 4d 00 85 ed 74 b9 e8 04 a2 4d 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <75> 28 48 8b 5b 48 e8 e4 a1 4d 00 48 89 d8 5b 5d 41 5c c3 48 89 df
RSP: 0018:ffffc90000a4ef20 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90000a4ef48 RCX: 0000000000000000
RDX: 1ffff92000149df2 RSI: ffffffff813a516c RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: dffffc0000000000 R12: ffffc90000a4ef90
R13: ffffffff81758b50 R14: ffffc90000a4f008 R15: ffff888019a59dc0
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b497ea000 CR3: 0000000021801000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3478 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc+0x172/0x3b0 mm/slub.c:3502
 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2794 [inline]
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2804 [inline]
 add_free_nid.isra.0+0x11a/0x8f0 fs/f2fs/node.c:2296
 scan_free_nid_bits fs/f2fs/node.c:2447 [inline]
 __f2fs_build_free_nids+0x936/0xe30 fs/f2fs/node.c:2481
 f2fs_build_free_nids+0x5a/0xb0 fs/f2fs/node.c:2539
 f2fs_balance_fs_bg+0x186/0xf60 fs/f2fs/segment.c:484
 f2fs_write_node_pages+0x176/0x7b0 fs/f2fs/node.c:2117
 do_writepages+0x1b4/0x690 mm/page-writeback.c:2553
 __writeback_single_inode+0x158/0xe70 fs/fs-writeback.c:1603
 writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
 wb_writeback+0x2a5/0xa90 fs/fs-writeback.c:2070
 wb_do_writeback fs/fs-writeback.c:2217 [inline]
 wb_workfn+0x29c/0xfd0 fs/fs-writeback.c:2257
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>