INFO: task syz-executor:5847 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21048 pid:5847 tgid:5847 ppid:1 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
__folio_lock mm/filemap.c:1675 [inline]
folio_lock include/linux/pagemap.h:1133 [inline]
__filemap_get_folio+0x167/0xa40 mm/filemap.c:1929
truncate_inode_pages_range+0x3cf/0xb90 mm/truncate.c:388
evict+0x517/0x9c0 fs/inode.c:812
dispose_list fs/inode.c:852 [inline]
evict_inodes+0x64c/0x6d0 fs/inode.c:906
generic_shutdown_super+0x9a/0x2c0 fs/super.c:628
kill_block_super+0x44/0x90 fs/super.c:1766
deactivate_locked_super+0xbc/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
task_work_run+0x1d1/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b7abd01f7
RSP: 002b:00007ffc653a3ac8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4b7ac51d7d RCX: 00007f4b7abd01f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc653a3b80
RBP: 00007ffc653a3b80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc653a4c10
R13: 00007f4b7ac51d7d R14: 000000000005d477 R15: 00007ffc653a4c50
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d9a8dc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8dc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8dc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:5/187:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc90003a57bc0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90003a57bc0 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
2 locks held by kworker/u8:6/1110:
#0: ffff88805e28d138 ((wq_completion)btrfs-flush_delalloc#190){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88805e28d138 ((wq_completion)btrfs-flush_delalloc#190){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc90004c9fbc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90004c9fbc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
11 locks held by kworker/u8:7/1125:
2 locks held by kworker/u8:15/1512:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc9000589fbc0 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000589fbc0 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
2 locks held by kworker/u8:17/1514:
2 locks held by getty/5602:
#0: ffff88823bf468a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5847:
#0: ffff8880307060d0 (&type->s_umount_key#92){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880307060d0 (&type->s_umount_key#92){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880307060d0 (&type->s_umount_key#92){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
2 locks held by syz-executor/5849:
1 lock held by udevd/8060:
2 locks held by udevd/10552:
4 locks held by syz.0.700/12396:
#0: ffff88803bc49a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x19f/0x3d0 mm/mmap_lock.c:147
#1: ffff888023a32600 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x150/0x310 mm/memory.c:3361
#2: ffff88805e7484a8 (&ei->i_mmap_lock){++++}-{4:4}, at: btrfs_page_mkwrite+0x608/0x1a80 fs/btrfs/file.c:1920
#3: ffff888023a30118 (&wb->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#3: ffff888023a30118 (&wb->list_lock){+.+.}-{3:3}, at: locked_inode_to_wb_and_lock_list+0x208/0x310 fs/fs-writeback.c:341
7 locks held by syz.0.700/12397:
#0: ffff888023a32488 (sb_writers#14){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160
#1: ffff88805e748648 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
#1: ffff88805e748648 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: btrfs_inode_lock+0x51/0xe0 fs/btrfs/inode.c:362
#2: ffff888023a32778 (sb_internal#2){.+.+}-{0:0}, at: btrfs_sync_file+0xbf9/0x1180 fs/btrfs/file.c:1726
#3: ffff88803c10ae80 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x41b/0xca0 fs/btrfs/transaction.c:296
#4: ffff88803c10aea8 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x41b/0xca0 fs/btrfs/transaction.c:296
#5: ffff88805edd6408 (&root->log_mutex){+.+.}-{4:4}, at: btrfs_sync_log+0x151/0x29b0 fs/btrfs/tree-log.c:2980
#6: ffff88803d2cce48 (&sb->s_type->i_lock_key#39){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#6: ffff88803d2cce48 (&sb->s_type->i_lock_key#39){+.+.}-{3:3}, at: wbc_attach_fdatawrite_inode+0x20/0x70 fs/fs-writeback.c:778
3 locks held by syz.0.700/12428:
#0: ffff888023a320d0 (&type->s_umount_key#60){+.+.}-{4:4}, at: do_remount fs/namespace.c:3321 [inline]
#0: ffff888023a320d0 (&type->s_umount_key#60){+.+.}-{4:4}, at: path_mount+0xcd2/0xfe0 fs/namespace.c:4115
#1: ffff88803c108ec8 (&fs_info->ordered_operations_mutex){+.+.}-{4:4}, at: btrfs_wait_ordered_roots+0xdb/0x6b0 fs/btrfs/ordered-data.c:828
#2: ffff88805edd69a8 (&root->ordered_extent_mutex){+.+.}-{4:4}, at: btrfs_wait_ordered_extents+0x217/0xcc0 fs/btrfs/ordered-data.c:772
1 lock held by syz.0.700/12431:
2 locks held by syz.5.704/12434:
3 locks held by syz.3.706/12437:
1 lock held by udevadm/12438:
1 lock held by syz.4.707/12440:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12438 Comm: udevadm Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:validate_chain+0x3/0x2140 kernel/locking/lockdep.c:3864
Code: 4c 89 ff 29 f5 0f 82 91 fe ff ff eb b3 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 <41> 56 41 55 41 54 53 48 81 ec e0 00 00 00 49 89 cf 65 48 8b 05 24
RSP: 0018:ffffc9000d2cf848 EFLAGS: 00000086
RAX: ffffffff929efb88 RBX: 0000000000000000 RCX: c57865e9e60eadd5
RDX: 0000000000000001 RSI: ffff88801ef6a8e0 RDI: ffff88801ef69dc0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81cd6926
R10: ffffc9000d2cfa78 R11: ffffffff81aaf080 R12: 000000000000400c
R13: ffff88801ef6a8e0 R14: ffff88801ef6a8e0 R15: c57865e9e60eadd5
FS: 00007f5f0895f880(0000) GS:ffff8881269bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005585391b15f8 CR3: 000000006a354000 CR4: 00000000003526f0
Call Trace:
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
is_bpf_text_address+0x47/0x2b0 kernel/bpf/core.c:776
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
slab_free_hook mm/slub.c:2383 [inline]
slab_free mm/slub.c:4695 [inline]
kmem_cache_free+0x3ef/0x510 mm/slub.c:4797
fput_close_sync+0x119/0x200 fs/file_table.c:573
__do_sys_close fs/open.c:1587 [inline]
__se_sys_close fs/open.c:1572 [inline]
__x64_sys_close+0x7f/0x110 fs/open.c:1572
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f08abba67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffdb24f7238 EFLAGS: 00000297 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055853919e2a0 RCX: 00007f5f08abba67
RDX: 00007f5f08b95ea0 RSI: 00005585391afa50 RDI: 0000000000000005
RBP: 00007f5f08b95ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000
R13: 000055853919e2a0 R14: 00007ffdb24f72a0 R15: 00007ffdb24f7280