INFO: task syz-executor:5842 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21928 pid:5842 tgid:5842 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x165c/0x5520 kernel/sched/core.c:6966
__schedule_loop kernel/sched/core.c:7049 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7064
wb_wait_for_completion+0x3e8/0x790 fs/fs-writeback.c:227
sync_inodes_sb+0x225/0xbf0 fs/fs-writeback.c:2942
sync_filesystem+0x17a/0x230 fs/sync.c:64
generic_shutdown_super+0x77/0x2d0 fs/super.c:625
kill_block_super+0x44/0x90 fs/super.c:1725
xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2284
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a6bb9da57
RSP: 002b:00007ffd10d8cc38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f0a6bc32048 RCX: 00007f0a6bb9da57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd10d8ccf0
RBP: 00007ffd10d8ccf0 R08: 00007ffd10d8dcf0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd10d8dd80
R13: 00007f0a6bc32048 R14: 00000000000714d4 R15: 00007ffd10d8ddc0
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5596:
#0: ffff8880325460a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5842:
#0: ffff888032e7e0d8 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888032e7e0d8 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888032e7e0d8 (&type->s_umount_key#60){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1:
ffff888026744810
(
&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:396 [inline]
&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x209/0xbf0 fs/fs-writeback.c:2940
1 lock held by udevd/7524:
4 locks held by kworker/u8:13/8032:
2 locks held by syz.1.1482/12988:
#0: ffffffff8fdbe568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:577
#1: ffffffff8e963438 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
3 locks held by syz.8.1488/13002:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
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:162 [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:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 8032 Comm: kworker/u8:13 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:try_to_wake_up+0x223/0x1380 kernel/sched/core.c:4270
Code: ff e8 81 c8 1c 0a 83 7c 24 24 01 0f 84 94 05 00 00 43 0f b6 44 25 00 84 c0 0f 85 16 07 00 00 c7 45 18 00 02 00 00 4c 8d 7d 34 <4d> 89 fe 49 c1 ee 03 43 0f b6 04 26 84 c0 0f 85 19 07 00 00 41 8b
RSP: 0018:ffffc90000a08d38 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 1ffff110063553dd RCX: 0000000080010004
RDX: 0000000000000000 RSI: ffffffff8c287dc0 RDI: ffffffff8c287d80
RBP: ffff888031aa9e80 R08: ffffffff9031b4f7 R09: 1ffffffff206369e
R10: dffffc0000000000 R11: fffffbfff206369f R12: dffffc0000000000
R13: 1ffff110063553d3 R14: ffff888031aa9ee8 R15: ffff888031aa9eb4
FS: 0000000000000000(0000) GS:ffff88812535c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a5fd9f000 CR3: 000000007ce5e000 CR4: 00000000003526f0
Call Trace:
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2190
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x435/0x8e0 kernel/time/hrtimer.c:2112
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 a2 1a 21 00 fb eb 44 e8 9a 1a 21 00 e8 55 3d 0a 0a 4d 85 f6 74 94 e8 8b 1a 21 00 fb 48 c7 c7 80 f6 94 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 18
RSP: 0018:ffffc9000d8edac0 EFLAGS: 00000293
RAX: ffffffff81a50705 RBX: ffffffff81a5057f RCX: ffff888028c8db80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e94f680
RBP: ffffc9000d8edb70 R08: ffffffff9031b4f7 R09: 1ffffffff206369e
R10: dffffc0000000000 R11: fffffbfff206369f R12: 0000000000000000
R13: 000000000000004b R14: 0000000000000200 R15: 1ffff92001b1db5c
_printk+0xdd/0x130 kernel/printk/printk.c:2504
print_hex_dump+0x1d2/0x2b0 lib/hexdump.c:286
xfs_hex_dump+0x3d/0x50 fs/xfs/xfs_message.c:110
xfs_buf_verifier_error+0x1cc/0x2a0 fs/xfs/xfs_error.c:330
xfs_allocbt_read_verify+0x5f/0xe0 fs/xfs/libxfs/xfs_alloc_btree.c:-1
__xfs_buf_ioend+0x332/0x6f0 fs/xfs/xfs_buf.c:1084
xfs_buf_iowait+0x156/0x480 fs/xfs/xfs_buf.c:1293
_xfs_buf_read fs/xfs/xfs_buf.c:597 [inline]
xfs_buf_read_map+0x324/0xa10 fs/xfs/xfs_buf.c:663
xfs_trans_read_buf_map+0x1db/0x8f0 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline]
xfs_btree_read_buf_block+0x2b0/0x490 fs/xfs/libxfs/xfs_btree.c:1402
xfs_btree_lookup_get_block+0x297/0x510 fs/xfs/libxfs/xfs_btree.c:1907
xfs_btree_lookup+0x45a/0x1350 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+0x219/0xd30 fs/xfs/libxfs/xfs_alloc.c:626
xfs_alloc_cur_finish+0xd5/0x4a0 fs/xfs/libxfs/xfs_alloc.c:1117
xfs_alloc_ag_vextent_near+0xd70/0x1280 fs/xfs/libxfs/xfs_alloc.c:1776
xfs_alloc_vextent_iterate_ags+0x640/0x950 fs/xfs/libxfs/xfs_alloc.c:3764
xfs_alloc_vextent_start_ag+0x378/0x850 fs/xfs/libxfs/xfs_alloc.c:3839
xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3619 [inline]
xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3663 [inline]
xfs_bmapi_allocate+0x17c1/0x2da0 fs/xfs/libxfs/xfs_bmap.c:3938
xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4447 [inline]
xfs_bmapi_convert_delalloc+0x87a/0x1520 fs/xfs/libxfs/xfs_bmap.c:4503
xfs_map_blocks fs/xfs/xfs_aops.c:450 [inline]
xfs_writeback_range+0x69e/0xf90 fs/xfs/xfs_aops.c:494
iomap_writeback_range fs/iomap/buffered-io.c:1777 [inline]
iomap_writeback_folio+0x15f2/0x2740 fs/iomap/buffered-io.c:1896
iomap_writepages+0x167/0x2e0 fs/iomap/buffered-io.c:1959
xfs_vm_writepages+0x2fa/0x3e0 fs/xfs/xfs_aops.c:708
do_writepages+0x32e/0x550 mm/page-writeback.c:2571
__writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1762
writeback_sb_inodes+0x979/0x19d0 fs/fs-writeback.c:2054
wb_writeback+0x445/0xb00 fs/fs-writeback.c:2239
wb_do_writeback fs/fs-writeback.c:2386 [inline]
wb_workfn+0x3f8/0xf10 fs/fs-writeback.c:2426
process_one_work kernel/workqueue.c:3302 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245