INFO: task syz.0.16:6569 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.16 state:D stack:28968 pid:6569 tgid:6558 ppid:6467 task_flags:0x400040 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7307
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 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:1025 [inline]
lock_two_directories+0x16b/0x220 fs/namei.c:3331
lock_rename fs/namei.c:3365 [inline]
do_renameat2+0x36f/0xa50 fs/namei.c:5311
__do_sys_rename fs/namei.c:5411 [inline]
__se_sys_rename fs/namei.c:5409 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f170fe969
RSP: 002b:00007f4f1634d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f4f17326080 RCX: 00007f4f170fe969
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000200000000000
RBP: 00007f4f17180ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f4f17326080 R15: 00007ffc7c452168
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
7 locks held by kworker/0:2/1561:
2 locks held by getty/5557:
#0: ffff88823bf320a0 (&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+0x444/0x1400 drivers/tty/n_tty.c:2222
1 lock held by kworker/0:4/5979:
#0: ffff8880b883add8 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:638
3 locks held by syz.0.16/6560:
4 locks held by syz.0.16/6569:
#0: ffff888032c1a480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888032c1a880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff888032c1a880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff8880562aef48 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff8880562aef48 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff888041109088 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff888041109088 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
4 locks held by syz.1.17/6635:
4 locks held by syz.1.17/6640:
#0: ffff8880368be480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff8880368be880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff8880368be880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff88804102bfe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff88804102bfe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff88805616a838 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff88805616a838 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
3 locks held by syz.2.18/6665:
4 locks held by syz.2.18/6669:
#0: ffff8880378a8480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff8880378a8880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff8880378a8880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff888056263410 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff888056263410 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff888056264bc0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff888056264bc0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
1 lock held by kmmpd-loop2/6666:
#0: ffff8880378a8480 (sb_writers#4){.+.+}-{0:0}, at: kmmpd+0x3b2/0xa50 fs/ext4/mmp.c:178
3 locks held by syz.3.19/6693:
4 locks held by syz.3.19/6697:
#0: ffff888023d72480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888023d72880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff888023d72880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff8880412b3fe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff8880412b3fe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff88804110cbc0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff88804110cbc0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
3 locks held by syz.4.20/6731:
4 locks held by syz.4.20/6735:
#0: ffff8880315e4480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff8880315e4880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff8880315e4880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff8880412b6f48 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff8880412b6f48 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff888056266370 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff888056266370 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
3 locks held by syz.5.21/6767:
4 locks held by syz.5.21/6771:
#0: ffff888053aea480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888053aea880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff888053aea880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff88805631bfe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff88805631bfe8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff88805631d798 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff88805631d798 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
3 locks held by syz.6.22/6802:
4 locks held by syz.6.22/6806:
#0: ffff888034856480 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888034856880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3364 [inline]
#1: ffff888034856880 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa50 fs/namei.c:5311
#2: ffff88805627d798 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#2: ffff88805627d798 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3330
#3: ffff888056379c60 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#3: ffff888056379c60 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3331
=============================================
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+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 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]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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: 6693 Comm: syz.3.19 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:229 [inline]
RIP: 0010:mark_lock+0x2f/0x190 kernel/locking/lockdep.c:4731
Code: 41 55 41 54 53 8b 46 20 89 c1 81 e1 00 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 <25> ff 1f 00 00 48 0f a3 05 d4 56 0e 11 73 10 48 69 c0 c8 00 00 00
RSP: 0018:ffffc9000482ed68 EFLAGS: 00000002
RAX: 000000000004085d RBX: 0000000000000006 RCX: 0000000000000006
RDX: 0000000000000006 RSI: ffff888024f0c788 RDI: ffff888024f0bc00
RBP: 0000000000000040 R08: ffffffff8ed64977 R09: 1ffffffff1dac92e
R10: dffffc0000000000 R11: fffffbfff1dac92f R12: ffff888024f0c7d8
R13: ffff88805627b078 R14: ffff888024f0c788 R15: 0000000000000001
FS: 00007f191a33e6c0(0000) GS:ffff888126df4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559d82f73168 CR3: 0000000034552000 CR4: 00000000003526f0
Call Trace:
mark_held_locks kernel/locking/lockdep.c:4325 [inline]
__trace_hardirqs_on_caller kernel/locking/lockdep.c:4351 [inline]
lockdep_hardirqs_on_prepare+0x191/0x2a0 kernel/locking/lockdep.c:4410
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194
unlock_rt_mutex_safe kernel/locking/rtmutex.c:344 [inline]
rt_mutex_slowunlock+0x493/0x8a0 kernel/locking/rtmutex.c:1454
spin_unlock include/linux/spinlock_rt.h:105 [inline]
ext4_do_update_inode fs/ext4/inode.c:5630 [inline]
ext4_mark_iloc_dirty+0x55a/0x1ca0 fs/ext4/inode.c:6282
__ext4_mark_inode_dirty+0x4be/0x700 fs/ext4/inode.c:6488
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6517
__mark_inode_dirty+0x2ec/0xe10 fs/fs-writeback.c:2566
mark_inode_dirty include/linux/fs.h:2614 [inline]
dquot_alloc_space include/linux/quotaops.h:319 [inline]
dquot_alloc_block include/linux/quotaops.h:336 [inline]
ext4_xattr_block_set+0x12ca/0x2ac0 fs/ext4/xattr.c:2053
ext4_xattr_set_handle+0xdfb/0x1590 fs/ext4/xattr.c:2452
ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
security_inode_init_security+0x2a0/0x3f0 security/security.c:1891
__ext4_new_inode+0x3314/0x3cb0 fs/ext4/ialloc.c:1325
ext4_create+0x22d/0x460 fs/ext4/namei.c:2822
lookup_open fs/namei.c:3796 [inline]
open_last_lookups fs/namei.c:3895 [inline]
path_openat+0x1500/0x3840 fs/namei.c:4131
do_filp_open+0x1fa/0x410 fs/namei.c:4161
do_sys_openat2+0x121/0x1c0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f191b0ce969
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:00007f191a33e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f191b2f5fa0 RCX: 00007f191b0ce969
RDX: 0000000000101042 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f191b150ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f191b2f5fa0 R15: 00007fff1ec75828