INFO: task syz.2.203:7765 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.203 state:D stack:22696 pid:7765 tgid:7762 ppid:5612 task_flags:0x440140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:293 [inline]
__down_common+0x3b7/0x850 kernel/locking/semaphore.c:318
down+0x80/0xd0 kernel/locking/semaphore.c:100
xfs_buf_lock+0x153/0x4c0 fs/xfs/xfs_buf.c:917
xfs_buf_item_unpin+0x1c5/0x710 fs/xfs/xfs_buf_item.c:551
xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline]
xlog_cil_committed+0x9c6/0x1110 fs/xfs/xfs_log_cil.c:995
xlog_cil_process_committed+0x154/0x1b0 fs/xfs/xfs_log_cil.c:1025
xlog_state_shutdown_callbacks+0x26d/0x370 fs/xfs/xfs_log.c:438
xlog_force_shutdown+0x31a/0x3f0 fs/xfs/xfs_log.c:3408
xfs_do_force_shutdown+0x2ae/0x6d0 fs/xfs/xfs_fsops.c:509
xfs_trans_read_buf_map+0x47f/0x820 fs/xfs/xfs_trans_buf.c:280
xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline]
xfs_btree_read_buf_block+0x2ae/0x4a0 fs/xfs/libxfs/xfs_btree.c:1402
xfs_btree_lookup_get_block+0x294/0x4f0 fs/xfs/libxfs/xfs_btree.c:1907
xfs_btree_lookup+0x43f/0x1320 fs/xfs/libxfs/xfs_btree.c:2018
xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:166 [inline]
xfs_alloc_lookup_le fs/xfs/libxfs/xfs_alloc.c:212 [inline]
xfs_free_ag_extent+0x268/0x1750 fs/xfs/libxfs/xfs_alloc.c:2080
__xfs_free_extent+0x36e/0x4f0 fs/xfs/libxfs/xfs_alloc.c:4047
xfs_extent_free_finish_item+0x297/0x680 fs/xfs/xfs_extfree_item.c:553
xfs_defer_finish_one+0x5ef/0xd60 fs/xfs/libxfs/xfs_defer.c:595
xfs_defer_finish_noroll+0x914/0x1320 fs/xfs/libxfs/xfs_defer.c:707
xfs_defer_finish+0x1c/0x180 fs/xfs/libxfs/xfs_defer.c:741
xfs_bunmapi_range+0xbc/0x140 fs/xfs/libxfs/xfs_bmap.c:6167
xfs_itruncate_extents_flags+0x2f9/0x9b0 fs/xfs/xfs_inode.c:1072
xfs_itruncate_extents fs/xfs/xfs_inode.h:608 [inline]
xfs_vn_setattr_size+0xb79/0x10b0 fs/xfs/xfs_iops.c:1096
xfs_vn_setattr+0x261/0x310 fs/xfs/xfs_iops.c:1154
notify_change+0xbb8/0xec0 fs/attr.c:556
do_truncate+0x1c2/0x250 fs/open.c:68
handle_truncate fs/namei.c:4305 [inline]
do_open fs/namei.c:4704 [inline]
path_openat+0x3009/0x3850 fs/namei.c:4859
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_sys_openat2+0x115/0x200 fs/open.c:1395
do_sys_open fs/open.c:1401 [inline]
__do_sys_open fs/open.c:1409 [inline]
__se_sys_open fs/open.c:1405 [inline]
__x64_sys_open+0x11e/0x150 fs/open.c:1405
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75136ace59
RSP: 002b:00007f7511906028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f7513925fa0 RCX: 00007f75136ace59
RDX: 0000000000000001 RSI: 0000000000088a81 RDI: 0000200000000100
RBP: 00007f7513742e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7513926038 R14: 00007f7513925fa0 R15: 00007ffce0ba2598
INFO: task syz.2.203:7834 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.203 state:D stack:27000 pid:7834 tgid:7762 ppid:5612 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
xlog_wait fs/xfs/xfs_log_priv.h:604 [inline]
xlog_wait_on_iclog+0x49b/0x6f0 fs/xfs/xfs_log.c:791
xlog_force_lsn+0x4b4/0x950 fs/xfs/xfs_log.c:2951
__xfs_trans_commit+0x7f7/0xc20 fs/xfs/xfs_trans.c:877
xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:926
xfs_sync_sb_buf+0x13f/0x230 fs/xfs/libxfs/xfs_sb.c:1490
xfs_ioc_setlabel+0x1d7/0x340 fs/xfs/xfs_ioctl.c:1081
xfs_file_ioctl+0x988/0x1680 fs/xfs/xfs_ioctl.c:1238
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75136ace59
RSP: 002b:00007f75118e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7513926090 RCX: 00007f75136ace59
RDX: 0000200000000200 RSI: 0000000041009432 RDI: 0000000000000004
RBP: 00007f7513742e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7513926128 R14: 00007f7513926090 R15: 00007ffce0ba2598
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
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+0xfd7/0x1030 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17 Comm: pr/legacy Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:401
Code: e8 ce 2b 8b fc 44 89 f9 d3 e3 49 83 ee 80 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 3f 9c f4 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90000167a08 EFLAGS: 00000202
RAX: 1ffffffff3369300 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8539cb70 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff99b49a20 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888126142000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd55ebb7e20 CR3: 000000006c8d4000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:128 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:150 [inline]
wait_for_lsr+0x190/0x300 drivers/tty/serial/8250/8250_port.c:1973
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3210 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3275 [inline]
serial8250_console_write+0x1232/0x1bd0 drivers/tty/serial/8250/8250_port.c:3360
console_emit_next_record kernel/printk/printk.c:3163 [inline]
console_flush_one_record+0x642/0xb50 kernel/printk/printk.c:3269
legacy_kthread_func+0x1b6/0x250 kernel/printk/printk.c:3712
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