INFO: task kworker/1:6:5927 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:6 state:D
stack:20648 pid:5927 tgid:5927 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: xfs-sync/loop6 xfs_flush_inodes_worker
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
wb_wait_for_completion+0x360/0x680 fs/fs-writeback.c:226
sync_inodes_sb+0x1c9/0xb40 fs/fs-writeback.c:2894
xfs_flush_inodes_worker+0x61/0x80 fs/xfs/xfs_super.c:662
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task syz-executor:7796 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21216 pid:7796 tgid:7796 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7020
rwsem_down_write_slowpath+0x872/0xfe0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
inode_lock include/linux/fs.h:1028 [inline]
vfs_unlink+0xed/0x6c0 fs/namei.c:5421
do_unlinkat+0x3ac/0x5d0 fs/namei.c:5505
__do_sys_unlink fs/namei.c:5540 [inline]
__se_sys_unlink fs/namei.c:5538 [inline]
__x64_sys_unlink+0x47/0x50 fs/namei.c:5538
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c5118ecf7
RSP: 002b:00007ffc778c61d8 EFLAGS: 00000206
ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4c5118ecf7
RDX: 00007ffc778c6200 RSI: 00007ffc778c6290 RDI: 00007ffc778c6290
RBP: 00007ffc778c6290 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc778c7380
R13: 00007f4c51213d7d R14: 000000000003be73 R15: 00007ffc778c8450
INFO: task syz.6.603:8765 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.603 state:D stack:19192 pid:8765 tgid:8765 ppid:7796 task_flags:0x400640 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
__flush_work+0x9b9/0xbc0 kernel/workqueue.c:4331
xfs_file_buffered_write+0x266/0x8a0 fs/xfs/xfs_file.c:1000
__kernel_write_iter+0x428/0x910 fs/read_write.c:619
dump_emit_page fs/coredump.c:1298 [inline]
dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
coredump_write+0x1121/0x18b0 fs/coredump.c:1049
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
get_signal+0x1108/0x1340 kernel/signal.c:3019
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x177/0x660 kernel/entry/common.c:196
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: 0033:0x7f4c5118f751
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4c513e5fa0 RCX: 00007f4c5118f749
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f4c51213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f4c513e6038 R14: 00007f4c513e5fa0 R15: 00007ffc778c8038
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0:
ffffffff8e13f2e0
(rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
(rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
(rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5584:
#0:
ffff888030dfa0a0
(&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+0x449/0x1460 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5823:
#0: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:956
4 locks held by kworker/1:6/5927:
#0: ffff8880784f8548 ((wq_completion)xfs-sync/loop6){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
#1: ffffc90004fcfb80 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
#2: ffff8880544aa0e0 (&type->s_umount_key#69){++++}-{4:4}, at: xfs_flush_inodes_worker+0x45/0x80 fs/xfs/xfs_super.c:661
#3:
ffff888025628820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
ffff888025628820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1ad/0xb40 fs/fs-writeback.c:2892
9 locks held by kworker/u8:14/6038:
3 locks held by syz-executor/7796:
#0:
ffff8880544aa420
(
sb_writers
#17
){++++}-{0:0}
, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888057691230 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline]
#1: ffff888057691230 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline]
#1: ffff888057691230 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline]
#1: ffff888057691230 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{4:4}, at: do_unlinkat+0x28c/0x5d0 fs/namei.c:5486
#2: ffff88804756a130
(
&sb->s_type->i_mutex_key#29){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
&sb->s_type->i_mutex_key#29){++++}-{4:4}, at: vfs_unlink+0xed/0x6c0 fs/namei.c:5421
2 locks held by syz.6.603/8765:
#0:
ffff8880544aa420
(
sb_writers
#17){++++}-{0:0}, at: do_coredump fs/coredump.c:1126 [inline]
#17){++++}-{0:0}, at: vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
#1:
ffff88804756a130
(
&sb->s_type->i_mutex_key
#29
){++++}-{4:4}
, at: xfs_ilock+0xee/0x370 fs/xfs/xfs_inode.c:149
1 lock held by syz.9.1052/10883:
#0: ffffffff8e144d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3816
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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]
__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:363 [inline]
watchdog+0xe40/0xe90 kernel/hung_task.c:557
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6038 Comm: kworker/u8:14 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-7:6)
RIP: 0010:put_dec+0xba/0xe0 lib/vsprintf.c:313
Code: 41 29 c7 48 b9 57 78 13 b1 2f 65 a5 39 48 89 d8 48 f7 e1 48 89 d3 48 c1 eb 33 4c 89 f7 44 89 fe e8 5b 88 00 00 49 89 c6 eb 0f c1 21 68 f6 eb 08 e8 ba 21 68 f6 4c 89 fb 4c 89 f7 89 de 5b 41
RSP: 0018:ffffc9000b3c5258 EFLAGS: 00000297
RAX: ffffffff8b5995ff RBX: 000000000000018d RCX: ffff88802dc71e80
RDX: 0000000000000000 RSI: 000000000000018d RDI: 0000000005f5e0ff
RBP: ffffc9000b3c53a0 R08: ffffc9000b3c5317 R09: 0000000000000000
R10: ffffc9000b3c5300 R11: fffff52001678a63 R12: 000000000000018d
R13: 000000000000018d R14: ffffc9000b3c5300 R15: 0000000005ffff0a
FS: 0000000000000000(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe37153fd8 CR3: 000000006761e000 CR4: 00000000003526f0
Call Trace:
number+0x2f8/0xf60 lib/vsprintf.c:520
vsnprintf+0x8e5/0xee0 lib/vsprintf.c:2912
sprintf+0xd9/0x120 lib/vsprintf.c:3111
print_time kernel/printk/printk.c:1357 [inline]
info_print_prefix+0x155/0x310 kernel/printk/printk.c:1383
record_print_text+0x154/0x420 kernel/printk/printk.c:1432
printk_get_next_message+0x26d/0x7b0 kernel/printk/printk.c:3018
console_emit_next_record kernel/printk/printk.c:3083 [inline]
console_flush_one_record kernel/printk/printk.c:3215 [inline]
console_flush_all+0x514/0xb60 kernel/printk/printk.c:3289
__console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
console_unlock+0xbb/0x190 kernel/printk/printk.c:3359
vprintk_emit+0x4f8/0x5f0 kernel/printk/printk.c:2426
_printk+0xcf/0x120 kernel/printk/printk.c:2451
__xfs_printk fs/xfs/xfs_message.c:24 [inline]
_xfs_alert_tag+0x1cb/0x2d0 fs/xfs/xfs_message.c:74
xfs_buf_verifier_error+0x150/0x2a0 fs/xfs/xfs_error.c:299
xfs_allocbt_read_verify+0x5f/0xe0 fs/xfs/libxfs/xfs_alloc_btree.c:-1
__xfs_buf_ioend+0x332/0x6d0 fs/xfs/xfs_buf.c:1174
xfs_buf_iowait+0x143/0x440 fs/xfs/xfs_buf.c:1381
_xfs_buf_read fs/xfs/xfs_buf.c:643 [inline]
xfs_buf_read_map+0x325/0xa30 fs/xfs/xfs_buf.c:709
xfs_trans_read_buf_map+0x1d7/0x8a0 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline]
xfs_btree_read_buf_block+0x290/0x470 fs/xfs/libxfs/xfs_btree.c:1402
xfs_btree_lookup_get_block+0x28d/0x500 fs/xfs/libxfs/xfs_btree.c:1907
xfs_btree_lookup+0x4e1/0x1410 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+0x21b/0xd20 fs/xfs/libxfs/xfs_alloc.c:626
xfs_alloc_ag_vextent_size+0xfa4/0x18e0 fs/xfs/libxfs/xfs_alloc.c:2002
xfs_alloc_vextent_iterate_ags+0x5e4/0x910 fs/xfs/libxfs/xfs_alloc.c:3767
xfs_alloc_vextent_start_ag+0x378/0x830 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+0x188e/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+0x674/0xf30 fs/xfs/xfs_aops.c:489
iomap_writeback_range fs/iomap/buffered-io.c:1744 [inline]
iomap_writeback_folio+0x1408/0x23f0 fs/iomap/buffered-io.c:1862
iomap_writepages+0x162/0x2d0 fs/iomap/buffered-io.c:1922
xfs_vm_writepages+0x296/0x310 fs/xfs/xfs_aops.c:701
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030
wb_writeback+0x42b/0xaa0 fs/fs-writeback.c:2216
wb_do_writeback fs/fs-writeback.c:2363 [inline]
wb_workfn+0x3f9/0xed0 fs/fs-writeback.c:2403
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246