INFO: task kworker/u8:3:49 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3 state:D stack:21072 pid:49 tgid:49 ppid:2 task_flags:0x4208160 flags:0x00004000
Workqueue: writeback wb_workfn
(flush-7:6)
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28
hfsplus_cat_write_inode+0x1e6/0x7a0 fs/hfsplus/inode.c:592
write_inode fs/fs-writeback.c:1525 [inline]
__writeback_single_inode+0x6f1/0xff0 fs/fs-writeback.c:1745
writeback_sb_inodes+0x6c7/0x1010 fs/fs-writeback.c:1976
__writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2047
wb_writeback+0x44f/0xaf0 fs/fs-writeback.c:2158
wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
wb_do_writeback fs/fs-writeback.c:2315 [inline]
wb_workfn+0xaef/0xef0 fs/fs-writeback.c:2343
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x3fc/0x770 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: 26456 Comm: syz.6.3143 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rdtsc_ordered arch/x86/include/asm/tsc.h:57 [inline]
RIP: 0010:delay_tsc+0x71/0xc0 arch/x86/lib/delay.c:72
Code: 00 00 e8 72 a8 17 f6 65 8b 05 3b fb 27 07 85 c0 74 1c f3 90 bf 01 00 00 00 e8 ab a6 17 f6 e8 16 3c 01 00 39 c5 75 0e 0f 01 f9 <66> 90 eb bd e8 d6 71 bb f5 eb dd 4c 29 fb e8 fc 3b 01 00 89 c5 0f
RSP: 0018:ffffc90004a0ec30 EFLAGS: 00000046
RAX: 0000000012fa9326 RBX: 0000000000000993 RCX: 0000000000000001
RDX: 000000000000025b RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000001 R08: ffff888024010237 R09: 1ffff11004802046
R10: dffffc0000000000 R11: ffffffff8b7854a0 R12: 1ffffffff33bdece
R13: 00000000ffffffff R14: 0000025b12fa8aba R15: 00000000000007d9
FS: 00007f3cc09116c0(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001008 CR3: 0000000032935000 CR4: 0000000000350ef0
Call Trace:
udelay include/asm-generic/delay.h:62 [inline]
wait_for_lsr+0x160/0x2f0 drivers/tty/serial/8250/8250_port.c:1990
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3288 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3311 [inline]
serial8250_console_write+0x134c/0x1ba0 drivers/tty/serial/8250/8250_port.c:3396
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x728/0xc40 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
hfsplus_bnode_read_u16 fs/hfsplus/bnode.c:101 [inline]
hfsplus_bnode_dump+0x322/0x450 fs/hfsplus/bnode.c:403
hfsplus_brec_remove+0x480/0x550 fs/hfsplus/brec.c:229
__hfsplus_delete_attr+0x1d4/0x360 fs/hfsplus/attributes.c:299
hfsplus_delete_attr+0x231/0x2d0 fs/hfsplus/attributes.c:345
hfsplus_removexattr fs/hfsplus/xattr.c:796 [inline]
__hfsplus_setxattr+0x768/0x1fe0 fs/hfsplus/xattr.c:279
hfsplus_setxattr+0x11e/0x180 fs/hfsplus/xattr.c:436
hfsplus_user_setxattr+0x40/0x60 fs/hfsplus/xattr_user.c:30
__vfs_removexattr+0x431/0x470 fs/xattr.c:518
__vfs_removexattr_locked+0x1ed/0x230 fs/xattr.c:553
vfs_removexattr+0x80/0x1b0 fs/xattr.c:575
removexattr fs/xattr.c:1023 [inline]
filename_removexattr fs/xattr.c:1052 [inline]
path_removexattrat+0x35d/0x690 fs/xattr.c:1088
__do_sys_removexattr fs/xattr.c:1100 [inline]
__se_sys_removexattr fs/xattr.c:1097 [inline]
__x64_sys_removexattr+0x62/0x70 fs/xattr.c:1097
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: 0033:0x7f3cbfb8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3cc0911038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5
RAX: ffffffffffffffda RBX: 00007f3cbfdb5fa0 RCX: 00007f3cbfb8ebe9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000040
RBP: 00007f3cbfc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3cbfdb6038 R14: 00007f3cbfdb5fa0 R15: 00007ffcbea83bc8