INFO: task syz.5.3199:22234 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.5.3199 state:D stack:24968 pid:22234 tgid:22231 ppid:5840 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
__wait_on_freeing_inode+0x166/0x3b0 fs/inode.c:2554
find_inode_fast+0x30c/0x550 fs/inode.c:1103
iget_locked+0xd0/0x6a0 fs/inode.c:1461
__ext4_iget+0x245/0x45c0 fs/ext4/inode.c:5163
ext4_xattr_inode_cache_find fs/ext4/xattr.c:1550 [inline]
ext4_xattr_inode_lookup_create+0x447/0x1cf0 fs/ext4/xattr.c:1589
ext4_xattr_block_set+0x229/0x2ad0 fs/ext4/xattr.c:1918
ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
__vfs_setxattr+0x43c/0x480 fs/xattr.c:218
__vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252
vfs_setxattr+0x163/0x360 fs/xattr.c:339
do_setxattr fs/xattr.c:654 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:682
path_setxattrat+0x3eb/0x440 fs/xattr.c:726
__do_sys_setxattr fs/xattr.c:760 [inline]
__se_sys_setxattr fs/xattr.c:756 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdcd0d9c819
RSP: 002b:00007fdcd1c00028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fdcd1016090 RCX: 00007fdcd0d9c819
RDX: 0000200000001400 RSI: 0000200000000100 RDI: 0000200000000380
RBP: 00007fdcd0e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdcd1016128 R14: 00007fdcd1016090 R15: 00007fff74085e28
INFO: task syz.5.3199:22247 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.5.3199 state:D stack:25688 pid:22247 tgid:22231 ppid:5840 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
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+0x169/0x10e0 fs/ext4/inode.c:187
evict+0x61e/0xb10 fs/inode.c:841
ext4_xattr_set_entry+0x12c6/0x1e20 fs/ext4/xattr.c:1849
ext4_xattr_block_set+0x621/0x2ad0 fs/ext4/xattr.c:1961
ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
__vfs_setxattr+0x43c/0x480 fs/xattr.c:218
__vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252
vfs_setxattr+0x163/0x360 fs/xattr.c:339
do_setxattr fs/xattr.c:654 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:682
path_setxattrat+0x3eb/0x440 fs/xattr.c:726
__do_sys_setxattr fs/xattr.c:760 [inline]
__se_sys_setxattr fs/xattr.c:756 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdcd0d9c819
RSP: 002b:00007fdcd1bdf028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fdcd1016180 RCX: 00007fdcd0d9c819
RDX: 0000200000000700 RSI: 0000200000000580 RDI: 00002000000006c0
RBP: 00007fdcd0e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdcd1016218 R14: 00007fdcd1016180 R15: 00007fff74085e28
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:7/140:
#0: ffff88801ae8c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline]
#0: ffff88801ae8c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385
#1: ffffc90002ec7c40 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline]
#1: ffffc90002ec7c40 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385
#2: ffffffff8e95da60 (&ssp->srcu_sup->srcu_barrier_mutex){+.+.}-{4:4}, at: srcu_barrier+0x8a/0x560 kernel/rcu/srcutree.c:1703
1 lock held by dhcpcd/5489:
2 locks held by getty/5580:
#0: ffff888036e220a0 (&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
5 locks held by kworker/u8:14/6371:
4 locks held by kworker/1:1/14164:
#0: ffff88801aebad40 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline]
#0: ffff88801aebad40 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385
#1: ffffc90003bdfc40 ((work_completion)(&(&ssp->srcu_sup->work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline]
#1: ffffc90003bdfc40 ((work_completion)(&(&ssp->srcu_sup->work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385
#2: ffffffff8e95d988 (&ssp->srcu_sup->srcu_gp_mutex){+.+.}-{4:4}, at: srcu_advance_state kernel/rcu/srcutree.c:1813 [inline]
#2: ffffffff8e95d988 (&ssp->srcu_sup->srcu_gp_mutex){+.+.}-{4:4}, at: process_srcu+0x6e/0x1630 kernel/rcu/srcutree.c:1973
#3: ffffffff8e962da8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#3: ffffffff8e962da8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
3 locks held by kworker/u8:19/16561:
#0: ffff88801ae8c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline]
#0: ffff88801ae8c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385
#1: ffffc90003a87c40 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline]
#1: ffffc90003a87c40 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385
#2: ffffffff8e95da60 (&ssp->srcu_sup->srcu_barrier_mutex){+.+.}-{4:4}, at: srcu_barrier+0x8a/0x560 kernel/rcu/srcutree.c:1703
3 locks held by syz.5.3199/22234:
#0: ffff88807978c410 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88803526c798 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#1: ffff88803526c798 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:338
#2: ffff88803526c490 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
#2: ffff88803526c490 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x19c/0x14c0 fs/ext4/xattr.c:2372
3 locks held by syz.5.3199/22247:
#0: ffff88807978c410 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88803526e4a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#1: ffff88803526e4a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:338
#2: ffff88803526e1a0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
#2: ffff88803526e1a0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x19c/0x14c0 fs/ext4/xattr.c:2372
1 lock held by syz-executor/23602:
1 lock held by syz-executor/23616:
1 lock held by syz.9.3466/23870:
=============================================
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 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:161 [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:346 [inline]
watchdog+0xfaa/0x1000 kernel/hung_task.c:515
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: 5489 Comm: dhcpcd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:839 [inline]
RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
RIP: 0010:kernfs_root+0x57/0x230 fs/kernfs/kernfs-internal.h:74
Code: 31 c0 45 31 c9 53 e8 18 bb 32 ff 48 83 c4 08 e8 ff ad 45 09 89 c5 31 ff 89 c6 e8 54 bb 56 ff 85 ed 74 10 e8 0b e3 3b ff 84 c0 <74> 0e e8 02 b7 56 ff eb 56 e8 fb b6 56 ff eb 4f e8 d4 ad 45 09 89
RSP: 0018:ffffc900036c77a0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff826e5c7c RCX: 0000000080000001
RDX: ffff8880272ddc40 RSI: ffffffff8c2875e0 RDI: ffffffff8c2875a0
RBP: 0000000000000001 R08: ffffffff826e5c7c R09: ffffffff8e95caa0
R10: dffffc0000000000 R11: ffffed10037d2a25 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88801eefdb40 R15: ffff88801eefdb40
FS: 00007f365cb53780(0000) GS:ffff888125231000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09a3fc7ff8 CR3: 000000002d011000 CR4: 0000000000350ef0
Call Trace:
kernfs_active fs/kernfs/dir.c:40 [inline]
kernfs_dop_revalidate+0x228/0x650 fs/kernfs/dir.c:1221
d_revalidate fs/namei.c:1030 [inline]
lookup_fast+0x253/0x5b0 fs/namei.c:-1
walk_component fs/namei.c:2274 [inline]
link_path_walk+0x720/0x18d0 fs/namei.c:2652
path_openat+0x2c3/0x3860 fs/namei.c:4854
do_file_open+0x23e/0x4a0 fs/namei.c:4887
do_sys_openat2+0x113/0x200 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f365cbdd407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff8dafbcb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f365cb53780 RCX: 00007f365cbdd407
RDX: 0000000000080000 RSI: 00007fff8dafbe30 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f365cb43000
R13: 00007f365cb43000 R14: 0000000000000001 R15: 00007fff8db148c0