INFO: task syz.2.420:7785 blocked for more than 143 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.420 state:D stack:20056 pid:7785 tgid:7785 ppid:5837 task_flags:0x40064c flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
wb_wait_for_completion+0x15f/0x260 fs/fs-writeback.c:216
sync_inodes_sb+0x1bb/0xa10 fs/fs-writeback.c:2873
sync_filesystem+0x17a/0x230 fs/sync.c:64
ovl_sync_fs+0x12f/0x160 fs/overlayfs/super.c:254
sync_filesystem+0x1cf/0x230 fs/sync.c:66
generic_shutdown_super+0x6f/0x2c0 fs/super.c:621
kill_anon_super+0x3b/0x70 fs/super.c:1281
deactivate_locked_super+0xbc/0x130 fs/super.c:473
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
task_work_run+0x1d4/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6b5/0x2300 kernel/exit.c:966
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
irqentry_exit_to_user_mode+0x7e/0x110 kernel/entry/common.c:73
exc_page_fault+0xab/0x100 arch/x86/mm/fault.c:1535
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fd44ce4f987
RSP: 002b:00007fd44de94120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fd44cf8efc9
RDX: 00007fd44de94140 RSI: 00007fd44de94270 RDI: 000000000000000b
RBP: 00007fd44d011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fd44d1e6038 R14: 00007fd44d1e5fa0 R15: 00007ffff943ed28
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8df430b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#0: ffffffff8df430b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:957
1 lock held by khungtaskd/31:
#0: ffffffff8df3d620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3d620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df3d620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u9:0/52:
#0: ffff888049ce8148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff888049ce8148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffff8880b8924048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
#2: ffff88807bc7c6d8 (&hdev->cmd_sync_work_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x295/0x3a0 net/bluetooth/hci_sync.c:315
#3: ffff88807bc7c0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x242/0xe30 net/bluetooth/hci_sync.c:5684
#4: ffff88807bc7c6d8 (&hdev->cmd_sync_work_lock){+.+.}-{4:4}, at: hci_cmd_sync_dequeue+0x44/0x340 net/bluetooth/hci_sync.c:893
5 locks held by kworker/u8:5/1158:
2 locks held by getty/5584:
#0: ffff88814d4f50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036ce2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
4 locks held by kworker/u8:10/6060:
3 locks held by syz.2.420/7785:
#0: ffff88806b36a0e0 (&type->s_umount_key#88){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88806b36a0e0 (&type->s_umount_key#88){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88806b36a0e0 (&type->s_umount_key#88){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505
#1: ffff88803075a0e0
(&type->s_umount_key#78){++++}-{4:4}, at: ovl_sync_fs+0x127/0x160 fs/overlayfs/super.c:253
#2: ffff888142bfe820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#2: ffff888142bfe820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10 fs/fs-writeback.c:2871
1 lock held by syz-executor/8964:
#0: ffff8880b883a058 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:646
2 locks held by syz.4.983/9638:
1 lock held by syz.8.995/9700:
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline]
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436
1 lock held by syz.8.995/9701:
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x71c/0xb70 net/core/rtnetlink.c:6957
1 lock held by syz.8.995/9703:
#0:
ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x71c/0xb70 net/core/rtnetlink.c:6957
1 lock held by syz.8.995/9704:
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff8f2cb648 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x7a4/0x1150 net/core/dev_ioctl.c:837
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
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: 6060 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:match_held_lock+0x7b/0xc0 kernel/locking/lockdep.c:5337
Code: c7 c2 30 e3 16 93 48 29 d0 48 c1 f8 03 48 ba 29 5c 8f c2 f5 28 5c 8f 48 0f af d0 bb 01 00 00 00 48 39 ca 74 02 31 db 89 d8 5b <41> 5e e9 89 f8 c9 f5 cc 90 e8 c7 da 3f f9 85 c0 74 22 83 3d 00 c4
RSP: 0018:ffffc900000078d8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff888031b6c8a0 RCX: 679652f7add5da00
RDX: 0000000000000005 RSI: ffff8880b883a058 RDI: ffff888031b6c8a0
RBP: 00000000ffffffff R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e
R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: 0000000000000046
R13: ffff888031b6bc80 R14: ffff8880b883a058 R15: 0000000000000006
FS: 0000000000000000(0000) GS:ffff88812613d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f567b3ad8 CR3: 00000000760fb000 CR4: 0000000000350ef0
Call Trace:
__lock_is_held kernel/locking/lockdep.c:5601 [inline]
lock_is_held_type+0xa8/0x190 kernel/locking/lockdep.c:5940
lock_is_held include/linux/lockdep.h:249 [inline]
lockdep_assert_rq_held kernel/sched/sched.h:1538 [inline]
rq_clock_pelt kernel/sched/pelt.h:71 [inline]
cfs_rq_clock_pelt kernel/sched/pelt.h:179 [inline]
update_load_avg+0xdb/0x1880 kernel/sched/fair.c:4718
enqueue_entity kernel/sched/fair.c:5261 [inline]
enqueue_task_fair+0x2d2/0x2920 kernel/sched/fair.c:6976
enqueue_task+0x75/0x420 kernel/sched/core.c:2092
activate_task kernel/sched/core.c:2134 [inline]
ttwu_do_activate+0x1f3/0x870 kernel/sched/core.c:3706
ttwu_queue kernel/sched/core.c:3969 [inline]
try_to_wake_up+0x721/0x12b0 kernel/sched/core.c:4293
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2034 [inline]
RIP: 0010:vprintk_emit+0x49d/0x590 kernel/printk/printk.c:2422
Code: 0f 84 34 ff ff ff e8 d2 ed 1f 00 fb eb 44 e8 ca ed 1f 00 e8 45 29 a6 09 4d 85 f6 74 94 e8 bb ed 1f 00 fb 48 c7 c7 00 16 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 0b 39
RSP: 0018:ffffc9000b28dea0 EFLAGS: 00000293
RAX: ffffffff81a018d5 RBX: ffffffff81a0172e RCX: ffff888031b6bc80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df31600
RBP: ffffc9000b28dfb0 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e
R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: 0000000000000000
R13: 000000000000004b R14: 0000000000000200 R15: 1ffff92001651bd8
_printk+0xcf/0x120 kernel/printk/printk.c:2448
print_hex_dump+0x1a8/0x260 lib/hexdump.c:285
xfs_hex_dump+0x3d/0x50 fs/xfs/xfs_message.c:110
xfs_buf_verifier_error+0x1cc/0x2a0 fs/xfs/xfs_error.c:310
xfs_agf_read_verify+0x16e/0x1f0 fs/xfs/libxfs/xfs_alloc.c:-1
__xfs_buf_ioend+0x342/0x6f0 fs/xfs/xfs_buf.c:1174
xfs_buf_iowait+0x167/0x480 fs/xfs/xfs_buf.c:1381
_xfs_buf_read fs/xfs/xfs_buf.c:643 [inline]
xfs_buf_read_map+0x335/0xa50 fs/xfs/xfs_buf.c:709
xfs_trans_read_buf_map+0x1d7/0x8e0 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline]
xfs_read_agf+0x281/0x5c0 fs/xfs/libxfs/xfs_alloc.c:3376
xfs_alloc_read_agf+0x17c/0xb70 fs/xfs/libxfs/xfs_alloc.c:3411
xfs_bmap_longest_free_extent+0x77/0x150 fs/xfs/libxfs/xfs_bmap.c:3158
xfs_filestream_pick_ag fs/xfs/xfs_filestream.c:81 [inline]
xfs_filestream_create_association fs/xfs/xfs_filestream.c:297 [inline]
xfs_filestream_select_ag+0x81b/0x1b00 fs/xfs/xfs_filestream.c:360
xfs_bmap_btalloc_filestreams fs/xfs/libxfs/xfs_bmap.c:3544 [inline]
xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3661 [inline]
xfs_bmapi_allocate+0x1651/0x2e00 fs/xfs/libxfs/xfs_bmap.c:3938
xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4447 [inline]
xfs_bmapi_convert_delalloc+0x7e2/0x1430 fs/xfs/libxfs/xfs_bmap.c:4503
xfs_map_blocks fs/xfs/xfs_aops.c:445 [inline]
xfs_writeback_range+0x674/0xf70 fs/xfs/xfs_aops.c:489
iomap_writeback_range fs/iomap/buffered-io.c:1593 [inline]
iomap_writeback_folio+0xe75/0x1c80 fs/iomap/buffered-io.c:1718
iomap_writepages+0x162/0x2d0 fs/iomap/buffered-io.c:1770
xfs_vm_writepages+0x296/0x310 fs/xfs/xfs_aops.c:701
do_writepages+0x32e/0x550 mm/page-writeback.c:2604
__writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1719
writeback_sb_inodes+0x6c7/0x1010 fs/fs-writeback.c:2015
wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2195
wb_do_writeback fs/fs-writeback.c:2342 [inline]
wb_workfn+0x409/0xef0 fs/fs-writeback.c:2382
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245