INFO: task syz.0.116:4948 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.116 state:D
stack:25728 pid:4948 ppid:4263 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
rwsem_down_write_slowpath+0xbed/0x1090 kernel/locking/rwsem.c:1189
inode_lock_nested include/linux/fs.h:793 [inline]
filename_create+0x1f2/0x450 fs/namei.c:3884
do_mknodat+0x16e/0x4c0 fs/namei.c:4030
__do_sys_mknod fs/namei.c:4076 [inline]
__se_sys_mknod fs/namei.c:4074 [inline]
__x64_sys_mknod+0x8a/0xa0 fs/namei.c:4074
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe3ca58f749
RSP: 002b:00007fe3c87d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fe3ca7e6090 RCX: 00007fe3ca58f749
RDX: 0000000000000700 RSI: 0000000000006000 RDI: 0000200000000180
RBP: 00007fe3ca613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe3ca7e6128 R14: 00007fe3ca7e6090 R15: 00007fff6ed0b808
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c92bab0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c92c2d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4026:
#0: ffff88814d10f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
2 locks held by syz-executor/4272:
#0: ffff888030ab40e0 (&type->s_umount_key#69){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8c930df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#1: ffffffff8c930df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x346/0x830 kernel/rcu/tree_exp.h:962
2 locks held by kworker/u4:5/4296:
8 locks held by kworker/1:9/4344:
2 locks held by kworker/u4:7/4361:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc9000461fd00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/1:11/4535:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90004a9fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
3 locks held by kworker/1:13/4537:
#0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90004c2fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2: ffffffff8c930df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#2: ffffffff8c930df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962
1 lock held by syz.0.116/4944:
1 lock held by syz.0.116/4948:
#0:
ffff888057e30198
(&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
(&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3884
1 lock held by syz.4.253/5592:
#0: ffffffff8c930cc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x600 kernel/rcu/tree.c:4023
1 lock held by rm/6877:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4944 Comm: syz.0.116 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_preemption_disabled+0x47/0x110 lib/smp_processor_id.c:55
Code: f1 75 65 8b 0d e2 ed f1 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 5b <41> 5e 41 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffff8880b8e2a648 RCX: 34953f4dfa84e500
RDX: ffff88801ce5d940 RSI: ffffffff8abef900 RDI: ffffffff8abef8c0
RBP: ffffc90000007e88 R08: dffffc0000000000 R09: fffffbfff1bfe1c6
R10: fffffbfff1bfe1c6 R11: 1ffffffff1bfe1c5 R12: ffffc90003c37d80
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 00007fe3c87f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd6e8457286 CR3: 000000002548b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x11/0xa0 kernel/rcu/tree.c:721
trace_hrtimer_expire_entry include/trace/events/timer.h:239 [inline]
__run_hrtimer kernel/time/hrtimer.c:1744 [inline]
__hrtimer_run_queues+0x4c9/0xd60 kernel/time/hrtimer.c:1811
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1948 [inline]
RIP: 0010:vprintk_emit+0x461/0x680 kernel/printk/printk.c:2302
Code: 85 8f 01 00 00 e8 af b9 1a 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 9e b9 1a 00 eb 06 e8 97 b9 1a 00 fb 48 c7 c7 c0 f3 91 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 37 db
RSP: 0018:ffffc9000c59f000 EFLAGS: 00000246
RAX: ffffffff81662639 RBX: ffffffff816624e5 RCX: 0000000000080000
RDX: ffffc9000c799000 RSI: 000000000007ffff RDI: ffffffff8c91f3c0
RBP: ffffc9000c59f0f0 R08: dffffc0000000000 R09: fffffbfff2119078
R10: fffffbfff2119078 R11: 1ffffffff2119077 R12: dffffc0000000000
R13: 1ffff920018b3e04 R14: 0000000000000200 R15: 0000000000000057
_printk+0xcc/0x110 kernel/printk/printk.c:2328
_erofs_err+0x11f/0x170 fs/erofs/super.c:35
z_erofs_pcluster_readmore+0x367/0x4f0 fs/erofs/zdata.c:1658
z_erofs_read_folio+0x23b/0x5b0 fs/erofs/zdata.c:1681
filemap_read_folio+0x160/0x760 mm/filemap.c:2490
do_read_cache_folio+0x2a0/0x760 mm/filemap.c:3659
erofs_bread+0x18e/0x670 fs/erofs/data.c:50
erofs_find_target_block fs/erofs/namei.c:102 [inline]
erofs_namei+0x28f/0xf00 fs/erofs/namei.c:175
erofs_lookup+0x14b/0x390 fs/erofs/namei.c:204
__lookup_slow+0x27d/0x3a0 fs/namei.c:1698
lookup_slow+0x53/0x70 fs/namei.c:1715
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x928/0xe50 fs/namei.c:2333
path_lookupat+0x9d/0x440 fs/namei.c:2486
filename_lookup+0x1f0/0x500 fs/namei.c:2516
user_path_at_empty+0x3e/0x60 fs/namei.c:2913
user_path_at include/linux/namei.h:57 [inline]
path_setxattr+0xae/0x280 fs/xattr.c:631
__do_sys_lsetxattr fs/xattr.c:659 [inline]
__se_sys_lsetxattr fs/xattr.c:655 [inline]
__x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe3ca58f749
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:00007fe3c87f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007fe3ca7e5fa0 RCX: 00007fe3ca58f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007fe3ca613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe3ca7e6038 R14: 00007fe3ca7e5fa0 R15: 00007fff6ed0b808