INFO: task syz.4.393:9700 blocked for more than 143 seconds.
Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.393 state:D stack:26840 pid:9700 tgid:9674 ppid:8808 task_flags:0x400040 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1694
inode_lock_nested include/linux/fs.h:912 [inline]
lock_rename fs/namei.c:3217 [inline]
do_renameat2+0x62c/0x13f0 fs/namei.c:5161
__do_sys_rename fs/namei.c:5273 [inline]
__se_sys_rename fs/namei.c:5271 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5271
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35b378d169
RSP: 002b:00007f35b4515038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f35b39a6080 RCX: 00007f35b378d169
RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000200000000580
RBP: 00007f35b380e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f35b39a6080 R15: 00007ffca2fa6338
</TASK>
INFO: task syz.4.393:9703 blocked for more than 144 seconds.
Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.393 state:D stack:23584 pid:9703 tgid:9674 ppid:8808 task_flags:0x400040 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline]
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x705/0xa40 kernel/locking/rwsem.c:1526
inode_lock_shared include/linux/fs.h:887 [inline]
open_last_lookups fs/namei.c:3749 [inline]
path_openat+0x88b/0x3590 fs/namei.c:3986
do_filp_open+0x27f/0x4e0 fs/namei.c:4016
do_sys_openat2+0x13e/0x1d0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35b378d169
RSP: 002b:00007f35b15f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f35b39a6160 RCX: 00007f35b378d169
RDX: 0000000000000000 RSI: 0000200000004280 RDI: ffffffffffffff9c
RBP: 00007f35b380e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f35b39a6160 R15: 00007ffca2fa6338
</TASK>
Showing all locks held in the system:
4 locks held by kworker/u8:1/13:
#0: ffff88801bef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801bef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc90000127c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000127c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8feb7410 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17a/0xd60 net/core/net_namespace.c:606
#3: ffffffff8fec3c48 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x6bf/0xd60 net/core/net_namespace.c:642
1 lock held by khungtaskd/31:
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:2/36:
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc90000ac7c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000ac7c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8fec3c48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:285
4 locks held by kworker/u8:7/1160:
#0: ffff8880206a9948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff8880206a9948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc90003f8fc60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90003f8fc60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffff8880613ec0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
#3: ffff88805d50e730 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x24a/0x590 fs/jfs/inode.c:102
1 lock held by udevd/5198:
2 locks held by getty/5575:
#0: ffff88814e8400a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fd62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by udevd/5827:
3 locks held by kworker/1:5/5906:
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc900041cfc60 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900041cfc60 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8fec3c48 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
3 locks held by udevd/7721:
#0: ffff8880b873e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
#1: ffff8880b8728948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987
#2: ffff888053e79158 (&ep->lock){....}-{3:3}, at: ep_poll_callback+0xd6/0xbc0 fs/eventpoll.c:1347
4 locks held by syz.4.393/9676:
2 locks held by syz.4.393/9700:
#0: ffff8880613ec420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547
#1: ffff88805d50eae0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#1: ffff88805d50eae0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3217 [inline]
#1: ffff88805d50eae0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: do_renameat2+0x62c/0x13f0 fs/namei.c:5161
1 lock held by syz.4.393/9703:
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:887 [inline]
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: open_last_lookups fs/namei.c:3749 [inline]
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: path_openat+0x88b/0x3590 fs/namei.c:3986
1 lock held by syz.4.393/9704:
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:887 [inline]
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: open_last_lookups fs/namei.c:3749 [inline]
#0: ffff88805d50eae0 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: path_openat+0x88b/0x3590 fs/namei.c:3986
1 lock held by syz-executor/11878:
#0: ffffffff8fec3c48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
#0: ffffffff8fec3c48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x47e/0x1bc0 net/ipv4/devinet.c:987
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9676 Comm: syz.4.393 Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:dtSplitRoot+0x8d7/0x18e0
Code: 48 c1 e3 05 4c 01 e3 49 89 dc 49 c1 ec 03 43 0f b6 04 2c 84 c0 75 15 44 0f b6 3b 45 84 ff 78 34 e8 2e 96 6a fe 4c 8b 64 24 08 <eb> ba 89 d9 80 e1 07 38 c1 7c e2 48 89 df e8 06 4e cf fe eb d8 e8
RSP: 0018:ffffc900046cf4a0 EFLAGS: 00000246
RAX: ffffffff83574942 RBX: ffff88807ce85000 RCX: 0000000000080000
RDX: ffffc90016cfa000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900046cf690 R08: ffffffff83574914 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807ce85000
R13: dffffc0000000000 R14: ffff88805d50e998 R15: 0000000000000000
FS: 00007f35b45436c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4fc1d0f683 CR3: 0000000033824000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
dtSplitUp fs/jfs/jfs_dtree.c:992 [inline]
dtInsert+0x12df/0x6d10 fs/jfs/jfs_dtree.c:870
jfs_mkdir+0x7fb/0xba0 fs/jfs/namei.c:270
vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4313
do_mkdirat+0x264/0x3a0 fs/namei.c:4336
__do_sys_mkdirat fs/namei.c:4351 [inline]
__se_sys_mkdirat fs/namei.c:4349 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4349
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35b378d169
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:00007f35b4543038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f35b39a5fa0 RCX: 00007f35b378d169
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: ffffffffffffff9c
RBP: 00007f35b380e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f35b39a5fa0 R15: 00007ffca2fa6338
</TASK>