INFO: task syz.5.524:9521 blocked for more than 143 secon[ 604.068068][ T38] INFO: task syz.5.524:9521 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.524 state:D stack:24600 pid:9521 tgid:9492 ppid:7481 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145f/0x5070 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7241
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1dfe/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock_nested include/linux/fs.h:1072 [inline]
__start_dirop fs/namei.c:2864 [inline]
start_dirop fs/namei.c:2875 [inline]
filename_create+0x1fb/0x360 fs/namei.c:4879
do_mkdirat+0xca/0x4b0 fs/namei.c:5156
__do_sys_mkdirat fs/namei.c:5186 [inline]
__se_sys_mkdirat fs/namei.c:5184 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e10c7f749
RSP: 002b:00007f6e0eebd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f6e10ed6090 RCX: 00007f6e10c7f749
RDX: 0000000000000059 RSI: 0000200000000340 RDI: 0000000000000005
RBP: 00007f6e10d03f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e10ed6128 R14: 00007f6e10ed6090 R15: 00007fff3be5ad78
INFO: task syz.5.524:9526 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.524 state:D stack:25944 pid:9526 tgid:9492 ppid:7481 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145f/0x5070 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
io_schedule+0x81/0xe0 kernel/sched/core.c:7789
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1159 [inline]
release_metapage+0x103/0xab0 fs/jfs/jfs_metapage.c:870
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9a3/0xde0 fs/jfs/jfs_metapage.c:753
dtSplitPage+0x7f8/0x3b20 fs/jfs/jfs_dtree.c:1471
dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
dtInsert+0x109b/0x5f40 fs/jfs/jfs_dtree.c:871
jfs_mkdir+0x6ec/0xa70 fs/jfs/namei.c:270
vfs_mkdir+0x52d/0x5d0 fs/namei.c:5130
do_mkdirat+0x27a/0x4b0 fs/namei.c:5164
__do_sys_mkdir fs/namei.c:5191 [inline]
__se_sys_mkdir fs/namei.c:5189 [inline]
__x64_sys_mkdir+0x6c/0x80 fs/namei.c:5189
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e10c7f749
RSP: 002b:00007f6e0ea79038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f6e10ed6270 RCX: 00007f6e10c7f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007f6e10d03f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e10ed6308 R14: 00007f6e10ed6270 R15: 00007fff3be5ad78
Showing all locks held in the system:
2 locks held by kworker/0:1/10:
4 locks held by kworker/u8:1/13:
#0: ffff88814047b138
((wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3232 [inline]
, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340
#1: ffffc90000127bc0 ((work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340
#2: ffff88805e4120d0 (&type->s_umount_key
#91){++++}-{4:4}
, at: super_trylock_shared+0x20/0xf0 fs/super.c:563
#3: ffff888066099f28
(&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:108
1 lock held by khungtaskd/38:
#0: ffffffff8d5ae940
(rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
(rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
(rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:6/158:
#0: ffff88814d296938 ((wq_completion)ipv6_addrconf
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340
#1: ffffc90003a87bc0 (
(work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3233 [inline]
, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340
#2: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4734
5 locks held by kworker/u8:9/1165:
2 locks held by kworker/u8:11/3181:
#0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3232 [inline]
, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340
#1: ffffc9000cd0fbc0 (connector_reaper_work
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340
1 lock held by dhcpcd/5460:
#0:
ffffffff8e8a5938
(rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: devinet_ioctl+0x323/0x1b20 net/ipv4/devinet.c:1120
2 locks held by getty/5554:
#0: ffff88814e3870a0
(&tty->ldisc_sem){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (
&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x44f/0x1460 drivers/tty/n_tty.c:2211
2 locks held by udevd/5946:
2 locks held by syz.5.524/9521:
#0: ffff88805e412480 (sb_writers
#29){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff88806609a2f8 (&type->i_mutex_dir_key#20/1
){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline]
){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline]
){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline]
){+.+.}-{4:4}, at: filename_create+0x1fb/0x360 fs/namei.c:4879
4 locks held by syz.5.524/9526:
#0: ffff88805e412480 (sb_writers#29
){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff88806609a2f8
(
&type->i_mutex_dir_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline]
&type->i_mutex_dir_key#20/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline]
&type->i_mutex_dir_key#20/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline]
&type->i_mutex_dir_key#20/1){+.+.}-{4:4}, at: filename_create+0x1fb/0x360 fs/namei.c:4879
#2: ffff888066099f28 (&jfs_ip->commit_mutex){+.+.}-{4:4}
, at: jfs_mkdir+0x1fb/0xa70 fs/jfs/namei.c:233
#3: ffff88806609a8e8 (&jfs_ip->commit_mutex/1){+.+.}-{4:4}
, at: jfs_mkdir+0x216/0xa70 fs/jfs/namei.c:234
2 locks held by syz.2.595/10051:
#0: ffff88805e4120d0 (&type->s_umount_key#91
){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
#1: ffff8881423988c0 (&bdi->wb_switch_rwsem
){+.+.}-{4:4}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
, at: sync_inodes_sb+0x1af/0xb80 fs/fs-writeback.c:2892
1 lock held by syz-executor/10473:
#0: ffffffff8e8a5938 (rtnl_mutex
){+.+.}-{4:4}
, at: tun_detach drivers/net/tun.c:634 [inline]
, at: tun_chr_close+0x41/0x1c0 drivers/net/tun.c:3436
3 locks held by kworker/u8:29/10656:
#0: ffff88813ff69938
(
(wq_completion)events_unbound
#2
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3232 [inline]
, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340
#1: ffffc9000f6e7bc0
((linkwatch_work).work){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3233 [inline]
, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340
#2: ffffffff8e8a5938
(rtnl_mutex
){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303
1 lock held by syz-executor/10929:
#0: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8ec/0x1c90 net/core/rtnetlink.c:4071
2 locks held by syz-executor/11165:
#0: ffffffff8e898800 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cc/0x570 net/core/net_namespace.c:577
#1: ffffffff8e8a5938 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2ab/0x800 net/ipv4/ip_tunnel.c:1146
6 locks held by syz.0.791/11425:
4 locks held by syz.1.792/11446:
=============================================
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 10/25/2025
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:160 [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+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11425 Comm: syz.0.791 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__bfs kernel/locking/lockdep.c:1815 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x197c/0x2cf0 kernel/locking/lockdep.c:5237
Code: 13 25 ff 0f 00 00 39 05 3e 1d 1e 11 73 06 89 05 36 1d 1e 11 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 f0 e0 47
RSP: 0018:ffffc900054c62b0 EFLAGS: 00000002
RAX: ffffffff9555ab68 RBX: 00000000000003cd RCX: 00000000000000c4
RDX: ffffffff953fd0a8 RSI: ffff8880271baac0 RDI: 00000000000003cd
RBP: 3a1eb888309c6f74 R08: ffffc900054c6278 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819cebf0 R12: ffffffff954b7398
R13: ffffffff925c7008 R14: ffff8880271b9e40 R15: 00000000000000c3
FS: 00007f104480e6c0(0000) GS:ffff888126cef000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3171eff8 CR3: 00000000371c4000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:164 [inline]
hrtimer_try_to_cancel+0x22b/0x420 kernel/time/hrtimer.c:1355
update_curr_dl_se+0x2f8/0xb70 kernel/sched/deadline.c:1487
update_curr+0x226/0x500 kernel/sched/fair.c:1227
put_prev_entity+0x41/0x230 kernel/sched/fair.c:5504
pick_next_task_fair+0x1d9a/0x2130 kernel/sched/fair.c:8959
__pick_next_task+0xeb/0x480 kernel/sched/core.c:5886
pick_next_task kernel/sched/core.c:-1 [inline]
__schedule+0x778/0x5070 kernel/sched/core.c:6805
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__wake_up_klogd+0x103/0x120 kernel/printk/printk.c:4609
vprintk_emit+0x4e1/0x550 kernel/printk/printk.c:-1
_printk+0xcf/0x120 kernel/printk/printk.c:2451
f2fs_printk+0x464/0x500 fs/f2fs/super.c:-1
f2fs_write_end_io+0x886/0xb60 fs/f2fs/data.c:351
__submit_merged_bio+0x256/0x660 fs/f2fs/data.c:540
f2fs_submit_page_write+0xd62/0x21a0 fs/f2fs/data.c:997
do_write_page+0x40f/0xac0 fs/f2fs/segment.c:4005
f2fs_outplace_write_data+0x11a/0x220 fs/f2fs/segment.c:4059
f2fs_do_write_data_page+0x113e/0x1650 fs/f2fs/data.c:2744
f2fs_write_single_data_page+0xaa9/0x1740 fs/f2fs/data.c:2859
f2fs_write_cache_pages fs/f2fs/data.c:3121 [inline]
__f2fs_write_data_pages fs/f2fs/data.c:3285 [inline]
f2fs_write_data_pages+0x1a2b/0x3290 fs/f2fs/data.c:3314
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
filemap_writeback mm/filemap.c:387 [inline]
filemap_fdatawrite_range mm/filemap.c:412 [inline]
filemap_write_and_wait_range+0x222/0x320 mm/filemap.c:684
f2fs_collapse_range+0x3aa/0x440 fs/f2fs/file.c:1602
f2fs_fallocate+0x550/0x970 fs/f2fs/file.c:2031
vfs_fallocate+0x672/0x7f0 fs/open.c:339
ksys_fallocate fs/open.c:363 [inline]
__do_sys_fallocate fs/open.c:368 [inline]
__se_sys_fallocate fs/open.c:366 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:366
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f10465af749
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:00007f104480e038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f1046805fa0 RCX: 00007f10465af749
RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000005
RBP: 00007f1046633f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1046806038 R14: 00007f1046805fa0 R15: 00007ffd12441118