EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 2 ====================================================== WARNING: possible circular locking dependency detected 4.19.190-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/10836 is trying to acquire lock: 00000000a405d76f (console_owner){-...}, at: console_trylock_spinning kernel/printk/printk.c:1697 [inline] 00000000a405d76f (console_owner){-...}, at: vprintk_emit+0x3fe/0x740 kernel/printk/printk.c:1964 but task is already holding lock: 00000000f623bc30 (&(&port->lock)->rlock){-.-.}, at: tty_port_close_start.part.0+0x28/0x540 drivers/tty/tty_port.c:574 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&(&port->lock)->rlock){-.-.}: tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:289 tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47 serial8250_tx_chars+0x490/0xaf0 drivers/tty/serial/8250/8250_port.c:1806 serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1893 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1866 [inline] serial8250_default_handle_irq+0xae/0x220 drivers/tty/serial/8250/8250_port.c:1909 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:797 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 ret_from_intr+0x0/0x1e native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x49/0x310 arch/x86/kernel/process.c:557 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x2ec/0x4b0 kernel/sched/idle.c:263 cpu_startup_entry+0xc5/0xe0 kernel/sched/idle.c:369 start_secondary+0x435/0x5c0 arch/x86/kernel/smpboot.c:271 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #1 (&port_lock_key){-.-.}: serial8250_console_write+0x89b/0xad0 drivers/tty/serial/8250/8250_port.c:3270 call_console_drivers kernel/printk/printk.c:1764 [inline] console_unlock+0xbb6/0x1110 kernel/printk/printk.c:2460 vprintk_emit+0x2d1/0x740 kernel/printk/printk.c:1965 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 register_console+0x87f/0xc90 kernel/printk/printk.c:2776 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:684 console_init+0x4cb/0x718 kernel/printk/printk.c:2862 start_kernel+0x686/0x911 init/main.c:659 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #0 (console_owner){-...}: console_trylock_spinning kernel/printk/printk.c:1718 [inline] vprintk_emit+0x43b/0x740 kernel/printk/printk.c:1964 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 tty_port_close_start.part.0+0x4f3/0x540 drivers/tty/tty_port.c:576 tty_port_close_start drivers/tty/tty_port.c:648 [inline] tty_port_close+0x46/0x160 drivers/tty/tty_port.c:641 tty_release+0x45e/0x1210 drivers/tty/tty_io.c:1678 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &(&port->lock)->rlock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&(&port->lock)->rlock); lock(&port_lock_key); lock(&(&port->lock)->rlock); lock(console_owner); *** DEADLOCK *** 2 locks held by syz-executor.4/10836: #0: 000000004225f9f8 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x6a/0xa0 drivers/tty/tty_mutex.c:19 #1: 00000000f623bc30 (&(&port->lock)->rlock){-.-.}, at: tty_port_close_start.part.0+0x28/0x540 drivers/tty/tty_port.c:574 stack backtrace: CPU: 0 PID: 10836 Comm: syz-executor.4 Not tainted 4.19.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 console_trylock_spinning kernel/printk/printk.c:1718 [inline] vprintk_emit+0x43b/0x740 kernel/printk/printk.c:1964 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 tty_port_close_start.part.0+0x4f3/0x540 drivers/tty/tty_port.c:576 tty_port_close_start drivers/tty/tty_port.c:648 [inline] tty_port_close+0x46/0x160 drivers/tty/tty_port.c:641 tty_release+0x45e/0x1210 drivers/tty/tty_io.c:1678 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007fff844186b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193eb RDX: 0000000000570120 RSI: 0000000000000081 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000570120 R13: 00007fff844187d0 R14: 000000000056bf60 R15: 000000000018fa0a EXT4-fs (loop2): orphan cleanup on readonly fs EXT4-fs error (device loop2): ext4_quota_enable:5837: inode #3: comm syz-executor.2: iget: bad extended attribute block 589832 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_quota_enable:5839: comm syz-executor.2: Bad quota inode # 3 EXT4-fs warning (device loop2): ext4_enable_quotas:5876: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop2): Cannot turn on quotas: error -117 EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro, overlayfs: failed to resolve './file0': -2 overlayfs: conflicting lowerdir path print_req_error: 9 callbacks suppressed print_req_error: I/O error, dev loop7, sector 256 print_req_error: I/O error, dev loop7, sector 0 buffer_io_error: 3 callbacks suppressed Buffer I/O error on dev loop7, logical block 0, lost async page write print_req_error: I/O error, dev loop7, sector 4 print_req_error: I/O error, dev loop7, sector 8 Buffer I/O error on dev loop7, logical block 1, lost async page write Buffer I/O error on dev loop7, logical block 2, lost async page write print_req_error: I/O error, dev loop7, sector 12 print_req_error: I/O error, dev loop7, sector 16 Buffer I/O error on dev loop7, logical block 3, lost async page write Buffer I/O error on dev loop7, logical block 4, lost async page write print_req_error: I/O error, dev loop7, sector 20 print_req_error: I/O error, dev loop7, sector 24 Buffer I/O error on dev loop7, logical block 5, lost async page write print_req_error: I/O error, dev loop7, sector 28 Buffer I/O error on dev loop7, logical block 6, lost async page write Buffer I/O error on dev loop7, logical block 7, lost async page write print_req_error: I/O error, dev loop7, sector 32 Buffer I/O error on dev loop7, logical block 9, lost async page write Buffer I/O error on dev loop7, logical block 8, lost async page write overlayfs: failed to resolve './file0': -2 overlayfs: failed to resolve './file0': -2 FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (46507!=0) EXT4-fs (loop2): group descriptors corrupted! netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (46507!=0) EXT4-fs (loop2): group descriptors corrupted! netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (46507!=0) EXT4-fs (loop2): group descriptors corrupted! netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (46507!=0) EXT4-fs (loop2): group descriptors corrupted! EXT4-fs (loop2): ext4_check_descriptors: Checksum for group 0 failed (46507!=0) EXT4-fs (loop2): group descriptors corrupted!