INFO: task kworker/u8:0:12 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:0    state:D stack:19752 pid:12    tgid:12    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:3)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
 f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
 f2fs_balance_fs+0x513/0x780 fs/f2fs/segment.c:454
 f2fs_write_inode+0x49d/0x870 fs/f2fs/inode.c:812
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x6ee/0xff0 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x6b5/0x1000 fs/fs-writeback.c:1976
 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2047
 wb_writeback+0x44f/0xaf0 fs/fs-writeback.c:2158
 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
 wb_do_writeback fs/fs-writeback.c:2315 [inline]
 wb_workfn+0xaef/0xef0 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
 #0: ffff8880202d4148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff8880202d4148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
 #1: ffffc90000117c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc90000117c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
 #2: ffff88807e5ea0e0 (&type->s_umount_key#68){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
 #3: ffff88807e7953b0 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
 #3: ffff88807e7953b0 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_balance_fs+0x513/0x780 fs/f2fs/segment.c:454
5 locks held by kauditd/30:
1 lock held by khungtaskd/31:
 #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5579:
 #0: ffff88814d5dc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/11704:
 #0: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
 #0: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b7/0x730 kernel/rcu/tree_exp.h:998
6 locks held by syz.3.716/11791:
1 lock held by syz-executor/12406:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:437
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13734 Comm: sed Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:check_preemption_disabled+0x50/0x120 lib/smp_processor_id.c:19
Code: c1 ff ff ff 7f 74 23 65 48 8b 0d 2b fe 22 07 48 3b 4c 24 08 0f 85 cc 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d e9 51 b5 02 00 cc <48> c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 74 c8 65
RSP: 0018:ffffc900040aeea8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888034270000 RCX: 0000000080000000
RDX: 0000000000000000 RSI: ffffffff8d74c135 RDI: ffffffff8bc10660
RBP: 0000000000000000 R08: ffffffff8f7dd377 R09: 1ffffffff1efba6e
R10: dffffc0000000000 R11: fffffbfff1efba6f R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881260fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ca6e8fb4c CR3: 0000000078920000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lockdep_recursion_inc kernel/locking/lockdep.c:467 [inline]
 lockdep_hardirqs_on_prepare+0xc3/0x2a0 kernel/locking/lockdep.c:4410
 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
 irqentry_exit+0x74/0x90 kernel/entry/common.c:357
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0xb9/0x360 kernel/locking/lockdep.c:5842
Code: 5c c3 df 0d 00 0f 84 fa 00 00 00 65 8b 05 3f 4d d4 10 85 c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 50 72 92 83 b8 ec 0a 00 00 00 <0f> 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 4c 89
RSP: 0018:ffffc900040aefd8 EFLAGS: 00000246
RAX: ffff888034270000 RBX: 0000000000000000 RCX: f950c146c18b2000
RDX: 0000000000000000 RSI: ffffffff8171ca22 RDI: 1ffffffff1be7b9c
RBP: ffffffff8171ca05 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900040af198 R11: ffffffff81acdd10 R12: 0000000000000002
R13: ffffffff8df3dce0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4147 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203
 ptlock_alloc mm/memory.c:7354 [inline]
 ptlock_init include/linux/mm.h:3074 [inline]
 pmd_ptlock_init include/linux/mm.h:3201 [inline]
 pagetable_pmd_ctor include/linux/mm.h:3228 [inline]
 pmd_alloc_one_noprof include/asm-generic/pgalloc.h:140 [inline]
 __pmd_alloc+0xba/0x350 mm/memory.c:6647
 pmd_alloc include/linux/mm.h:2965 [inline]
 __handle_mm_fault+0x926/0x5380 mm/memory.c:6100
 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309
 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_stos_alternative+0x40/0x80 arch/x86/lib/clear_page_64.S:99
Code: c9 75 f6 e9 02 03 04 00 48 89 07 48 83 c7 08 83 e9 08 74 ef 83 f9 08 73 ef eb de 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47
RSP: 0018:ffffc900040af9b0 EFLAGS: 00050206
RAX: 0000000000000000 RBX: 00007f6ca6e90310 RCX: 00000000000004b4
RDX: 0000000000000000 RSI: ffffffff8d922b3d RDI: 00007f6ca6e8fb4c
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff82090d80 R12: 00007f6ca6e8fb4c
R13: 0000000000000b4c R14: 00000000000004b4 R15: ffff8880548500a8
 __clear_user arch/x86/include/asm/uaccess_64.h:188 [inline]
 clear_user arch/x86/include/asm/uaccess_64.h:205 [inline]
 padzero fs/binfmt_elf.c:125 [inline]
 elf_load+0x4e0/0x6c0 fs/binfmt_elf.c:427
 load_elf_interp+0x469/0xaf0 fs/binfmt_elf.c:681
 load_elf_binary+0x19d2/0x27a0 fs/binfmt_elf.c:1246
 search_binary_handler fs/exec.c:1778 [inline]
 exec_binprm fs/exec.c:1810 [inline]
 bprm_execve+0x999/0x1440 fs/exec.c:1862
 do_execveat_common+0x510/0x6a0 fs/exec.c:1968
 do_execve fs/exec.c:2042 [inline]
 __do_sys_execve fs/exec.c:2118 [inline]
 __se_sys_execve fs/exec.c:2113 [inline]
 __x64_sys_execve+0x94/0xb0 fs/exec.c:2113
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff07e52c107
Code: Unable to access opcode bytes at 0x7ff07e52c0dd.
RSP: 002b:00007ffebf2ef3d8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055b71f0df080 RCX: 00007ff07e52c107
RDX: 000055b71f0df0a8 RSI: 000055b71f0df080 RDI: 000055b71f0df138
RBP: 000055b71f0df138 R08: 00007ffebf2f2e4a R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055b71f0df0a8
R13: 00007ff07e6f1e8b R14: 000055b71f0df0a8 R15: 0000000000000000
 </TASK>