INFO: task syz.1.193:7606 blocked for more than 143 seconds.
Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.193 state:D stack:28952 pid:7606 tgid:7573 ppid:5816 task_flags:0x400040 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: 0033:0x7f9cf4d8e969
RSP: 002b:00007f9cf2bf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007f9cf4fb6160 RCX: 00007f9cf4d8e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f9cf4e10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9cf4fb6160 R15: 00007ffcfe978ee8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
3 locks held by kworker/0:2/839:
3 locks held by kworker/u8:6/1144:
2 locks held by getty/5578:
#0: ffff88803095d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900033332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by kworker/u8:8/5893:
#0: ffff88801bf3d148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801bf3d148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900047c7c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900047c7c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
3 locks held by syz.1.193/7575:
2 locks held by syz.1.193/7606:
#0: ffff88803032a420 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556
#1: ffff888050954990 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
#1: ffff888050954990 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: do_rmdir+0x1b2/0x630 fs/namei.c:4501
3 locks held by syz-executor/9558:
1 lock held by cmp/9643:
#0: ffff8880b89399d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:605
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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: 7575 Comm: syz.1.193 Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ext4_update_other_inodes_time fs/ext4/inode.c:5154 [inline]
RIP: 0010:ext4_do_update_inode fs/ext4/inode.c:5216 [inline]
RIP: 0010:ext4_mark_iloc_dirty+0x69d/0x1ca0 fs/ext4/inode.c:5869
Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 4c 8b 7c 24 18 74 08 48 89 df e8 61 e4 af ff 4c 8b 33 49 8d 7e 08 48 89 f8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 80 3c 08 00 4c 8b 64 24 30 74 05 e8
RSP: 0018:ffffc9000ae37418 EFLAGS: 00000a02
RAX: 1ffff11006065801 RBX: ffff88803032a638 RCX: ffff88802d14da00
RDX: 0000000000000002 RSI: 0000000002000000 RDI: ffff88803032c008
RBP: ffffc9000ae37548 R08: ffff888077f5b2bb R09: 1ffff1100efeb657
R10: dffffc0000000000 R11: ffffed100efeb658 R12: ffff888056410028
R13: 0000000000000002 R14: ffff88803032c000 R15: ffff888056410000
FS: 00007f9cf5b476c0(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f29a0ba6e9c CR3: 00000000274a8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__ext4_mark_inode_dirty+0x4be/0x700 fs/ext4/inode.c:6074
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x2d1/0xdf0 fs/fs-writeback.c:2527
mark_inode_dirty_sync include/linux/fs.h:2550 [inline]
dquot_free_space include/linux/quotaops.h:380 [inline]
dquot_free_block include/linux/quotaops.h:390 [inline]
ext4_xattr_block_set+0x148e/0x2ac0 fs/ext4/xattr.c:2073
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+0x2a0/0x3f0 security/security.c:1852
__ext4_new_inode+0x3257/0x3bd0 fs/ext4/ialloc.c:1326
ext4_symlink+0x39e/0xb90 fs/ext4/namei.c:3386
vfs_symlink+0x140/0x2f0 fs/namei.c:4723
do_symlinkat+0x1b1/0x3f0 fs/namei.c:4749
__do_sys_symlink fs/namei.c:4770 [inline]
__se_sys_symlink fs/namei.c:4768 [inline]
__x64_sys_symlink+0x7a/0x90 fs/namei.c:4768
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: 0033:0x7f9cf4d8e969
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:00007f9cf5b47038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f9cf4fb5fa0 RCX: 00007f9cf4d8e969
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 00002000000005c0
RBP: 00007f9cf4e10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9cf4fb5fa0 R15: 00007ffcfe978ee8