Hello, syzbot found the following issue on: HEAD commit: 4a4be1ad3a6e Revert "vfs: Delete the associated dentry whe.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1466269a980000 kernel config: https://syzkaller.appspot.com/x/.config?x=47d282ddffae809f dashboard link: https://syzkaller.appspot.com/bug?extid=42986aeeddfd7ed93c8b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12a5b3ec980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=103820f2980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/91325320f37c/disk-4a4be1ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/49af253b674e/vmlinux-4a4be1ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/04d26ea378d5/bzImage-4a4be1ad.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2643c2ec211c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+42986aeeddfd7ed93c8b@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor150:5089 blocked for more than 143 seconds. Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor150 state:D stack:24224 pid:5089 tgid:5087 ppid:5086 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5408 [inline] __schedule+0x1796/0x49d0 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306 inode_lock include/linux/fs.h:791 [inline] vfs_rmdir+0x101/0x510 fs/namei.c:4203 do_rmdir+0x3b5/0x580 fs/namei.c:4273 __do_sys_rmdir fs/namei.c:4292 [inline] __se_sys_rmdir fs/namei.c:4290 [inline] __x64_sys_rmdir+0x49/0x60 fs/namei.c:4290 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: 0033:0x7f9b91eaed89 RSP: 002b:00007f9b91e65168 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 00007f9b91f375e8 RCX: 00007f9b91eaed89 RDX: ffffffffffffffb0 RSI: e0f7bef392ce73bd RDI: 0000000020000180 RBP: 00007f9b91f375e0 R08: 00007f9b91e656c0 R09: 0000000000000000 R10: 00007f9b91e656c0 R11: 0000000000000246 R12: 00007f9b91f375ec R13: 0000000000000006 R14: 00007fff5a763930 R15: 00007fff5a763a18 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4840: #0: ffff88802afc40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f0e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 3 locks held by syz-executor150/5089: #0: ffff88807cf1a420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff88807a2d9650 (&sb->s_type->i_mutex_key#14/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline] #1: ffff88807a2d9650 (&sb->s_type->i_mutex_key#14/1){+.+.}-{3:3}, at: do_rmdir+0x263/0x580 fs/namei.c:4261 #2: ffff88807a2d9650 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline] #2: ffff88807a2d9650 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: vfs_rmdir+0x101/0x510 fs/namei.c:4203 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1093 Comm: kworker/u8:7 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4798 [inline] RIP: 0010:__lock_acquire+0x876/0x1fd0 kernel/locking/lockdep.c:5087 Code: 8b 5d 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 80 15 f7 92 be 08 00 00 00 e8 c2 2b 86 00 48 0f a3 1d ca b2 84 11 <73> 1a 48 69 c3 c8 00 00 00 48 8d 98 80 74 c5 92 48 ba 00 00 00 00 RSP: 0018:ffffc900047af3d0 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000021 RCX: ffffffff817262ae RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92f71580 RBP: 0000000000000003 R08: ffffffff92f71587 R09: 1ffffffff25ee2b0 R10: dffffc0000000000 R11: fffffbfff25ee2b1 R12: 0000000000000005 R13: ffff8880223f8bc8 R14: 0000000000000005 R15: ffff8880223f8bc8 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e370ade680 CR3: 000000000e132000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __pte_offset_map_lock+0x1ba/0x300 mm/pgtable-generic.c:375 get_locked_pte include/linux/mm.h:2744 [inline] __text_poke+0x2c5/0xd30 arch/x86/kernel/alternative.c:1883 text_poke arch/x86/kernel/alternative.c:1968 [inline] text_poke_bp_batch+0x8cd/0xb30 arch/x86/kernel/alternative.c:2357 text_poke_flush arch/x86/kernel/alternative.c:2470 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.739 msecs --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
