EXT4-fs error (device loop5): __ext4_iget:5088: inode #3: block 524304: comm syz-executor.5: invalid block EXT4-fs error (device loop5): ext4_quota_enable:5846: comm syz-executor.5: Bad quota inode # 3 EXT4-fs warning (device loop5): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. ============================================ EXT4-fs (loop5): mount failed WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.4/27888 is trying to acquire lock: 00000000c4fa9c8d (&port_lock_key){-.-.}, at: uart_write+0x1ce/0x6f0 drivers/tty/serial/serial_core.c:591 but task is already holding lock: 00000000c4fa9c8d (&port_lock_key){-.-.}, at: serial8250_handle_irq.part.0+0x21/0x3d0 drivers/tty/serial/8250/8250_port.c:1876 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&port_lock_key); lock(&port_lock_key); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by syz-executor.4/27888: #0: 00000000c47d7085 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000c47d7085 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 00000000946046d5 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 00000000946046d5 (&type->i_mutex_dir_key#3/1){+.+.}, at: filename_create+0x15a/0x490 fs/namei.c:3638 #2: 000000009ebeb0f3 (&ei->i_data_sem){++++}, at: ext4_map_blocks+0x33e/0x1a50 fs/ext4/inode.c:578 #3: 0000000075899811 (&(&i->lock)->rlock){-.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] #3: 0000000075899811 (&(&i->lock)->rlock){-.-.}, at: serial8250_interrupt+0x3a/0x240 drivers/tty/serial/8250/8250_core.c:115 #4: 00000000c4fa9c8d (&port_lock_key){-.-.}, at: serial8250_handle_irq.part.0+0x21/0x3d0 drivers/tty/serial/8250/8250_port.c:1876 #5: 00000000cbd9bbd9 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:293 stack backtrace: CPU: 1 PID: 27888 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:152 uart_write+0x1ce/0x6f0 drivers/tty/serial/serial_core.c:591 n_hdlc_send_frames+0x278/0x470 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xa0/0xc0 drivers/tty/n_hdlc.c:479 tty_wakeup+0xd4/0x110 drivers/tty/tty_io.c:534 tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:50 serial8250_tx_chars+0x490/0xaf0 drivers/tty/serial/8250/8250_port.c:1813 serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1900 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1873 [inline] serial8250_default_handle_irq+0xae/0x220 drivers/tty/serial/8250/8250_port.c:1916 serial8250_interrupt+0x101/0x240 drivers/tty/serial/8250/8250_core.c:125 __handle_irq_event_percpu+0x27e/0x8e0 kernel/irq/handle.c:149 handle_irq_event_percpu kernel/irq/handle.c:189 [inline] handle_irq_event+0x102/0x290 kernel/irq/handle.c:206 handle_edge_irq+0x260/0xcf0 kernel/irq/chip.c:800 generic_handle_irq_desc include/linux/irqdesc.h:155 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1c0 arch/x86/kernel/irq.c:246 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:670 RIP: 0010:unwind_next_frame+0xa45/0x1400 arch/x86/kernel/unwind_orc.c:509 Code: 30 48 c1 ea 03 80 3c 02 00 0f 85 8c 09 00 00 48 8b 54 24 08 4d 89 66 38 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 52 09 00 00 49 8d 7e 58 49 c7 46 50 00 00 00 00 48 b8 00 00 RSP: 0018:ffff8880a20a72a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5 RAX: dffffc0000000000 RBX: 1ffff11014414e5d RCX: 0000000000000000 RDX: 1ffff11014414e84 RSI: ffff8880a20a7230 RDI: ffff8880a20a7a48 RBP: 0000000000000001 R08: ffffffff8b9f0002 R09: ffffffff8b9efffe R10: ffff8880a20a742f R11: 0000000000074071 R12: ffff8880a20a7a50 R13: ffff8880a20a7405 R14: ffff8880a20a73d0 R15: ffffffff8b9efffe __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc_array include/linux/slab.h:637 [inline] kcalloc include/linux/slab.h:648 [inline] ext4_find_extent+0x9bb/0xc70 fs/ext4/extents.c:894 ext4_ext_map_blocks+0x1c0/0x7390 fs/ext4/extents.c:4312 ext4_map_blocks+0xd88/0x1a50 fs/ext4/inode.c:580 ext4_getblk+0xad/0x4f0 fs/ext4/inode.c:993 ext4_bread+0x7c/0x210 fs/ext4/inode.c:1043 ext4_append+0x155/0x370 fs/ext4/namei.c:66 ext4_init_new_dir fs/ext4/namei.c:2659 [inline] ext4_mkdir+0x5bd/0xe10 fs/ext4/namei.c:2706 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819 do_mkdirat+0x262/0x2d0 fs/namei.c:3842 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7effa7125387 Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffed44b4b68 EFLAGS: 00000202 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007ffed44b4bf0 RCX: 00007effa7125387 RDX: 00000000000001ff RSI: 00007ffed44b4bf0 RDI: 00000000ffffff9c RBP: 00007ffed44b4bcc R08: 0000000000000000 R09: 0000000000000006 R10: 00007ffed44b4904 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000286204 R14: 0000000000000013 R15: 00007ffed44b4c30 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 8c 09 00 00 jne 0x99a e: 48 8b 54 24 08 mov 0x8(%rsp),%rdx 13: 4d 89 66 38 mov %r12,0x38(%r14) 17: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1e: fc ff df 21: 48 c1 ea 03 shr $0x3,%rdx 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 29: 0f 85 52 09 00 00 jne 0x981 <-- trapping instruction 2f: 49 8d 7e 58 lea 0x58(%r14),%rdi 33: 49 c7 46 50 00 00 00 movq $0x0,0x50(%r14) 3a: 00 3b: 48 rex.W 3c: b8 .byte 0xb8