INFO: task syz.0.17:6394 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:26656 pid:6394  tgid:6394  ppid:6308   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 io_schedule+0x7f/0xd0 kernel/sched/core.c:7835
 folio_wait_bit_common+0x6d8/0xbc0 mm/filemap.c:1323
 folio_lock include/linux/pagemap.h:1159 [inline]
 writeback_get_folio mm/page-writeback.c:2418 [inline]
 writeback_iter+0x8d8/0x12c0 mm/page-writeback.c:2512
 iomap_writepages+0x152/0x2e0 fs/iomap/buffered-io.c:1962
 gfs2_writepages+0x197/0x280 fs/gfs2/aops.c:174
 do_writepages+0x32e/0x550 mm/page-writeback.c:2554
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 filemap_fdatawrite+0x1e9/0x2f0 mm/filemap.c:418
 gfs2_ordered_write fs/gfs2/log.c:729 [inline]
 gfs2_log_flush+0x881/0x2510 fs/gfs2/log.c:1093
 gfs2_trans_end+0x37b/0x570 fs/gfs2/trans.c:163
 gfs2_page_mkwrite+0x14de/0x1990 fs/gfs2/file.c:535
 do_page_mkwrite+0x14d/0x310 mm/memory.c:3589
 wp_page_shared mm/memory.c:3990 [inline]
 do_wp_page+0x1a4b/0x5a00 mm/memory.c:4209
 handle_pte_fault mm/memory.c:6333 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0x1520/0x3310 mm/memory.c:6624
 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f24cd16ae9b
RSP: 002b:00007ffd57eb9368 EFLAGS: 00010202
RAX: 0000200000000040 RBX: 0000000000000004 RCX: 0000000000736f64
RDX: 0000000000000006 RSI: 000000006f64736d RDI: 0000200000000040
RBP: fffffffffffffffe R08: 0000001b2e320000 R09: 0000000000000001
R10: 7ffffffffffffff9 R11: 0000000000000009 R12: 00007ffd57eb9490
R13: 00007f24cd415fac R14: 00000000000217e2 R15: 00007f24cd415fa0
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e7648f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
 #0: ffffffff8e7648f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by khungtaskd/31:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:8/1098:
 #0: ffff888020291948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
 #0: ffff888020291948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3359
 #1: ffffc900046efc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3252 [inline]
 #1: ffffc900046efc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3359
 #2: ffff8880217200e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:565
 #3: ffff88807d93cea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xef/0x2510 fs/gfs2/log.c:1036
2 locks held by getty/5579:
 #0: ffff8880329660a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000331e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
4 locks held by syz.0.17/6394:
 #0: ffff8880526ee808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888021720518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3589
 #2: ffff888021720610 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:123
 #3: ffff88807d93cea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xef/0x2510 fs/gfs2/log.c:1036
1 lock held by gfs2_logd/syz:s/6415:
 #0: ffff88807d93cea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xef/0x2510 fs/gfs2/log.c:1036
2 locks held by gfs2_quotad/syz/6416:
 #0: ffff888021720610 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:123
 #1: ffff88807d93cea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: __gfs2_trans_begin+0x51e/0x910 fs/gfs2/trans.c:87

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
 watchdog+0xfd9/0x1030 kernel/hung_task.c:515
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7080 Comm: syz.1.172 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4731
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 74 8a 82 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 10 64 c5 93 eb 42 83 3d 3b 1a
RSP: 0018:ffffc90004f8f480 EFLAGS: 00000007
RAX: 00000000000000ac RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000008 RSI: ffff8880309e2a28 RDI: ffff8880309e1e80
RBP: 0000000000000100 R08: ffffffff822187a2 R09: ffffffff8e8836c0
R10: dffffc0000000000 R11: fffff520009f1eed R12: 00000000000000ac
R13: ffff8880309e2a28 R14: ffff8880309e1e80 R15: ffff8880309e29d8
FS:  00007f6dc12d36c0(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6db83ff000 CR3: 0000000078b1c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 mark_usage kernel/locking/lockdep.c:4674 [inline]
 __lock_acquire+0x6b5/0x2cf0 kernel/locking/lockdep.c:5191
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __fs_reclaim_acquire mm/page_alloc.c:4348 [inline]
 fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4362
 might_alloc include/linux/sched/mm.h:317 [inline]
 prepare_alloc_pages+0x152/0x650 mm/page_alloc.c:5018
 __alloc_frozen_pages_noprof+0x12f/0x380 mm/page_alloc.c:5239
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2509
 shmem_alloc_folio mm/shmem.c:1930 [inline]
 shmem_alloc_and_add_folio+0x445/0xf80 mm/shmem.c:1972
 shmem_get_folio_gfp+0x5a9/0x1670 mm/shmem.c:2567
 shmem_get_folio mm/shmem.c:2673 [inline]
 shmem_write_begin+0x16c/0x330 mm/shmem.c:3327
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3502
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6dc035cfce
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f6dc12d2da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6dc12d36c0 RCX: 00007f6dc035cfce
RDX: 0000000001000000 RSI: 00007f6db7400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f6dc12d2ee0 R14: 00007f6dc12d2ea0 R15: 00007f6db7400000
 </TASK>