INFO: task syz.1.38:5989 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.1.38 state:D stack:25144 pid:5989 tgid:5981 ppid:5634 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
__wait_on_freeing_inode+0x166/0x3b0 fs/inode.c:2619
find_inode_fast+0x3e0/0x740 fs/inode.c:1098
iget_locked+0xd0/0x6a0 fs/inode.c:1464
__ext4_iget+0x242/0x45b0 fs/ext4/inode.c:5301
ext4_xattr_inode_cache_find fs/ext4/xattr.c:1552 [inline]
ext4_xattr_inode_lookup_create+0x440/0x1d10 fs/ext4/xattr.c:1591
ext4_xattr_block_set+0x220/0x2a80 fs/ext4/xattr.c:1920
ext4_xattr_set_handle+0xe9b/0x1540 fs/ext4/xattr.c:2459
ext4_xattr_set+0x257/0x340 fs/ext4/xattr.c:2561
__vfs_setxattr+0x442/0x480 fs/xattr.c:223
__vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257
vfs_setxattr+0x163/0x360 fs/xattr.c:344
do_setxattr fs/xattr.c:662 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:690
path_setxattrat+0x408/0x450 fs/xattr.c:734
__do_sys_setxattr fs/xattr.c:768 [inline]
__se_sys_setxattr fs/xattr.c:764 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:764
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: 0033:0x7f1d5159ce59
RSP: 002b:00007f1d4f7d5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f1d51816090 RCX: 00007f1d5159ce59
RDX: 0000200000001400 RSI: 00002000000001c0 RDI: 0000200000000380
RBP: 00007f1d51632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d51816128 R14: 00007f1d51816090 R15: 00007ffc7aa710b8
INFO: task syz.1.38:5990 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.1.38 state:D stack:24672 pid:5990 tgid:5981 ppid:5634 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
mb_cache_entry_wait_unused+0x17d/0x280 fs/mbcache.c:148
ext4_evict_ea_inode+0x14d/0x2f0 fs/ext4/xattr.c:481
ext4_evict_inode+0x169/0x10c0 fs/ext4/inode.c:187
evict+0x624/0xb50 fs/inode.c:825
ext4_xattr_set_entry+0x179a/0x1ed0 fs/ext4/xattr.c:1851
ext4_xattr_block_set+0x1865/0x2a80 fs/ext4/xattr.c:1963
ext4_xattr_set_handle+0xe9b/0x1540 fs/ext4/xattr.c:2459
ext4_xattr_set+0x257/0x340 fs/ext4/xattr.c:2561
__vfs_setxattr+0x442/0x480 fs/xattr.c:223
__vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257
vfs_setxattr+0x163/0x360 fs/xattr.c:344
do_setxattr fs/xattr.c:662 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:690
path_setxattrat+0x408/0x450 fs/xattr.c:734
__do_sys_setxattr fs/xattr.c:768 [inline]
__se_sys_setxattr fs/xattr.c:764 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:764
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: 0033:0x7f1d5159ce59
RSP: 002b:00007f1d4f7b4028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f1d51816180 RCX: 00007f1d5159ce59
RDX: 0000200000000000 RSI: 00002000000001c0 RDI: 0000200000000040
RBP: 00007f1d51632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d51816218 R14: 00007f1d51816180 R15: 00007ffc7aa710b8
Showing all locks held in the system:
1 lock held by ksoftirqd/1/23:
1 lock held by khungtaskd/31:
#0: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5375:
#0: ffff88803658f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5606:
2 locks held by syz-executor/5630:
3 locks held by syz.1.38/5989:
#0: ffff888052bfc450 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#1: ffff8880531a6aa0 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#1: ffff8880531a6aa0 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:343
#2: ffff8880531a67e0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
#2: ffff8880531a67e0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x194/0x1540 fs/ext4/xattr.c:2374
3 locks held by syz.1.38/5990:
#0: ffff888052bfc450 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#1: ffff8880125f7400 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#1: ffff8880125f7400 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:343
#2: ffff8880125f7140 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
#2: ffff8880125f7140 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x194/0x1540 fs/ext4/xattr.c:2374
3 locks held by syz.9.849/9287:
=============================================
NMI backtrace for cpu 1
CPU: 1 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 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: 8283 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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 9e 8e 7b fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ef 1c e9 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 d5 9e c5 fb cc 44 89 f9 80 e1 07
RSP: 0018:ffffc9000371f5c8 EFLAGS: 00000002
RAX: 1ffffffff3500100 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: dffffc0000000000 R08: ffff8880259f8237 R09: 1ffff11004b3f046
R10: dffffc0000000000 R11: ffffffff854aa1b0 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9a800e40 R15: 0000000000000000
FS: 00005555948f1500(0000) GS:ffff88812522a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559490ca38 CR3: 000000002a3b0000 CR4: 0000000000350ef0
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+0x184/0x2f0 drivers/tty/serial/8250/8250_port.c:1982
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3229 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3294 [inline]
serial8250_console_write+0x12ef/0x1ba0 drivers/tty/serial/8250/8250_port.c:3379
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record kernel/printk/printk.c:3269 [inline]
console_flush_all+0x6ea/0xaf0 kernel/printk/printk.c:3343
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
_printk+0xdd/0x130 kernel/printk/printk.c:2504
_btrfs_printk+0x29a/0x320 fs/btrfs/messages.c:236
btrfs_put_super+0x118/0x1c0 fs/btrfs/super.c:74
generic_shutdown_super+0x13d/0x2d0 fs/super.c:647
kill_anon_super+0x3b/0x70 fs/super.c:1232
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2154
deactivate_locked_super+0xbc/0x130 fs/super.c:477
cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
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:70 [inline]
exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa48959e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc3a902868 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa4896322ca RCX: 00007fa48959e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc3a902920
RBP: 00007ffc3a902920 R08: 00007ffc3a903920 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc3a9039b0
R13: 00007fa4896322ca R14: 0000000000040d68 R15: 00007ffc3a9039f0