INFO: task syz.8.712:11747 blocked for more than 143 seconds.
Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.712 state:D stack:26152 pid:11747 tgid:11734 ppid:8693 task_flags:0x400140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
rwsem_down_write_slowpath+0xbec/0x1030 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+0x1b5/0x200 kernel/locking/rwsem.c:1694
inode_lock_nested include/linux/fs.h:902 [inline]
do_rmdir+0x1b2/0x630 fs/namei.c:4501
__do_sys_rmdir fs/namei.c:4528 [inline]
__se_sys_rmdir fs/namei.c:4526 [inline]
__x64_sys_rmdir+0x47/0x50 fs/namei.c:4526
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff3c718e969
RSP: 002b:00007ff3c7f2b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007ff3c73b6080 RCX: 00007ff3c718e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007ff3c7210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff3c73b6080 R15: 00007ffd30a2d598
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5573:
#0: ffff88802dd200a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036e32f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.8.712/11736:
2 locks held by syz.8.712/11747:
#0: ffff88806a5cc420 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556
#1: ffff88804d8eabd8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
#1: ffff88804d8eabd8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: do_rmdir+0x1b2/0x630 fs/namei.c:4501
2 locks held by syz-executor/11941:
#0: ffff8880579c40e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880579c40e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880579c40e0 (&type->s_umount_key#82){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505
#1: ffffffff8e365488 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
1 lock held by syz-executor/13636:
2 locks held by syz.3.910/13773:
#0: ffff88807a3540e0 (&type->s_umount_key#67/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:344
#1: ffffffff8e365488 (jfs_log_mutex){+.+.}-{4:4}, at: open_dummy_log fs/jfs/jfs_logmgr.c:1191 [inline]
#1: ffffffff8e365488 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogOpen+0x1a1/0xfb0 fs/jfs/jfs_logmgr.c:1066
3 locks held by syz.8.921/13977:
2 locks held by syz.6.922/13987:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11736 Comm: syz.8.712 Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:i_user_ns include/linux/fs.h:1457 [inline]
RIP: 0010:i_gid_read include/linux/fs.h:1472 [inline]
RIP: 0010:ext4_fill_raw_inode+0x346/0x22d0 fs/ext4/inode.c:4330
Code: 48 c1 e8 03 0f b6 04 18 84 c0 4c 89 74 24 18 0f 85 89 13 00 00 41 8b 34 24 e8 36 e3 4a ff 41 89 c5 48 8b 44 24 28 80 3c 18 00 <74> 08 4c 89 f7 e8 40 f5 ae ff 41 bc 90 07 00 00 4d 03 26 4c 89 e0
RSP: 0018:ffffc9000b1c6f70 EFLAGS: 00000246
RAX: 1ffff1100f1a4cc5 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000c001000 RSI: 000000000007ffff RDI: ffffffff8dddebc4
RBP: 0000000000008000 R08: ffff888078d26367 R09: 1ffff1100f1a4c6c
R10: dffffc0000000000 R11: ffffed100f1a4c6d R12: ffff888078d26604
R13: 0000000000000000 R14: ffff888078d26628 R15: ffff888078d26600
FS: 00007ff3c7f4c6c0(0000) GS:ffff8881261fd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd37e3e378 CR3: 00000000695a4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ext4_do_update_inode fs/ext4/inode.c:5208 [inline]
ext4_mark_iloc_dirty+0x54d/0x1ca0 fs/ext4/inode.c:5869
__ext4_mark_inode_dirty+0x4be/0x700 fs/ext4/inode.c:6074
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x2ce/0xdf0 fs/fs-writeback.c:2527
mark_inode_dirty include/linux/fs.h:2545 [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:2048
ext4_xattr_set_handle+0xdfb/0x1590 fs/ext4/xattr.c:2447
ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
security_inode_init_security+0x29d/0x3f0 security/security.c:1852
__ext4_new_inode+0x3257/0x3bd0 fs/ext4/ialloc.c:1326
ext4_create+0x22d/0x460 fs/ext4/namei.c:2824
lookup_open fs/namei.c:3701 [inline]
open_last_lookups fs/namei.c:3800 [inline]
path_openat+0x14f1/0x3830 fs/namei.c:4036
do_filp_open+0x1fa/0x410 fs/namei.c:4066
do_sys_openat2+0x121/0x1c0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff3c718e969
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:00007ff3c7f4c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff3c73b5fa0 RCX: 00007ff3c718e969
RDX: 000000000000275a RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007ff3c7210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff3c73b5fa0 R15: 00007ffd30a2d598