INFO: task syz-executor:5970 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:14416 pid:5970 tgid:5970 ppid:1 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1ac3/0x5090 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6840
wb_wait_for_completion+0x166/0x270 fs/fs-writeback.c:216
sync_inodes_sb+0x28f/0xb50 fs/fs-writeback.c:2821
sync_filesystem+0x176/0x230 fs/sync.c:64
generic_shutdown_super+0x72/0x2d0 fs/super.c:621
kill_block_super+0x44/0x90 fs/super.c:1710
xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2115
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
task_work_run+0x251/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c3158e497
RSP: 002b:00007ffc942d8698 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4c3160e08c RCX: 00007f4c3158e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc942d8750
RBP: 00007ffc942d8750 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc942d97e0
R13: 00007f4c3160e08c R14: 000000000001fbdf R15: 00007ffc942d9820
Showing all locks held in the system:
1 lock held by ksoftirqd/0/15:
1 lock held by khungtaskd/31:
#0:
ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
4 locks held by kworker/u8:2/36:
2 locks held by getty/5584:
#0: ffff888035e490a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5970:
#0: ffff88807940e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807940e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807940e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffff888142f7c7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#1: ffff888142f7c7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x270/0xb50 fs/fs-writeback.c:2819
1 lock held by syz.3.142/7325:
#0: ffff88807940e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807940e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor/8808:
#0:
ffffffff8eb3fc78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
ffffffff8eb3fc78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
1 lock held by syz.2.372/10133:
#0: ffffffff8eb3fc78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8eb3fc78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
3 locks held by udevadm/10160:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 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
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: writeback wb_workfn (flush-7:5)
RIP: 0010:do_raw_spin_lock+0x5/0x370 kernel/locking/spinlock_debug.c:114
Code: 80 c1 03 38 c1 7c 91 48 89 df e8 56 62 89 00 eb 87 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 00
RSP: 0018:ffffc90000007ad8 EFLAGS: 00000086
RAX: 66802acdca772c00 RBX: ffff88801aca0000 RCX: 66802acdca772c00
RDX: 0000000000000000 RSI: ffffffff8e2abebe RDI: ffff88801aca0000
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11003591238
R13: ffff88801ac95c00 R14: 0000000000000008 R15: ffff88801aca0000
FS: 0000000000000000(0000) GS:ffff88812525a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff96ea5fe8 CR3: 0000000028038000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__queue_work+0x785/0x10a0
call_timer_fn+0x189/0x650 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1835 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x699/0x8e0 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445
handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x702/0xa10 kernel/printk/printk.c:2431
Code: 00 e8 22 5d 21 00 4c 8d bc 24 a0 00 00 00 4d 85 e4 75 07 e8 10 5d 21 00 eb 06 e8 09 5d 21 00 fb 49 bc 00 00 00 00 00 fc ff df <48> c7 c7 00 63 a1 8e 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00
RSP: 0018:ffffc90000ac5760 EFLAGS: 00000293
RAX: ffffffff81a1f527 RBX: 0000000000000000 RCX: ffff888141ad1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000ac5870 R08: ffffffff81a1f500 R09: 1ffffffff2077a6e
R10: dffffc0000000000 R11: fffffbfff2077a6f R12: dffffc0000000000
R13: 1ffff92000158af0 R14: ffffffff81a1f362 R15: ffffc90000ac5800
_printk+0xd5/0x120 kernel/printk/printk.c:2457
print_hex_dump+0x1aa/0x260 lib/hexdump.c:285
xfs_hex_dump+0x3d/0x50 fs/xfs/xfs_message.c:110
xfs_buf_verifier_error+0x1ce/0x2a0 fs/xfs/xfs_error.c:466
xfs_allocbt_read_verify+0x5e/0xd0
__xfs_buf_ioend+0x1fd/0x690 fs/xfs/xfs_buf.c:1306
xfs_buf_iowait+0x180/0x4c0 fs/xfs/xfs_buf.c:1521
_xfs_buf_read fs/xfs/xfs_buf.c:746 [inline]
xfs_buf_read_map+0x3c4/0xb20 fs/xfs/xfs_buf.c:812
xfs_trans_read_buf_map+0x261/0xa90 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline]
xfs_btree_read_buf_block+0x371/0x5c0 fs/xfs/libxfs/xfs_btree.c:1402
xfs_btree_lookup_get_block+0x35e/0x630 fs/xfs/libxfs/xfs_btree.c:1907
xfs_btree_lookup+0x4ed/0x15f0 fs/xfs/libxfs/xfs_btree.c:2018
xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:166 [inline]
xfs_alloc_lookup_eq fs/xfs/libxfs/xfs_alloc.c:184 [inline]
xfs_alloc_fixup_trees+0x27f/0x1050 fs/xfs/libxfs/xfs_alloc.c:626
xfs_alloc_cur_finish+0xe6/0x500 fs/xfs/libxfs/xfs_alloc.c:1117
xfs_alloc_ag_vextent_near+0x133d/0x1960 fs/xfs/libxfs/xfs_alloc.c:1776
xfs_alloc_vextent_iterate_ags+0x5ed/0x950 fs/xfs/libxfs/xfs_alloc.c:3739
xfs_alloc_vextent_start_ag+0x406/0x980 fs/xfs/libxfs/xfs_alloc.c:3814
xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3764 [inline]
xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3809 [inline]
xfs_bmapi_allocate+0x1b17/0x3640 fs/xfs/libxfs/xfs_bmap.c:4222
xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4731 [inline]
xfs_bmapi_convert_delalloc+0x9b0/0x1a40 fs/xfs/libxfs/xfs_bmap.c:4787
xfs_map_blocks+0x7af/0x1030 fs/xfs/xfs_aops.c:364
iomap_writepage_map_blocks fs/iomap/buffered-io.c:1755 [inline]
iomap_writepage_map fs/iomap/buffered-io.c:1905 [inline]
iomap_writepages+0x107e/0x3080 fs/iomap/buffered-io.c:1959
xfs_vm_writepages+0xfe/0x150 fs/xfs/xfs_aops.c:483
do_writepages+0x36a/0x890 mm/page-writeback.c:2687
__writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x822/0x1360 fs/fs-writeback.c:1976
wb_writeback+0x415/0xb90 fs/fs-writeback.c:2156
wb_do_writeback fs/fs-writeback.c:2303 [inline]
wb_workfn+0x412/0x10b0 fs/fs-writeback.c:2343
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd30 kernel/workqueue.c:3400
kthread+0x7a9/0x920 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