dump_stack_lvl+0x8b/0xb3 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 5.18.0-rc2-next-20220414 #1 Not tainted ------------------------------------------------------ syz-executor.4/14534 is trying to acquire lock: ffffffff851167a0 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x316/0x550 but task is already holding lock: ffff888018785158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 should_fail.cold+0x5/0xa which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&port->lock){-.-.}-{2:2} : _raw_spin_lock_irqsave+0x39/0x50 should_failslab+0x5/0x10 tty_port_tty_get+0x1f/0x100 kmem_cache_alloc+0x5b/0x480 tty_port_default_wakeup+0x11/0x40 getname_flags.part.0+0x50/0x4f0 serial8250_tx_chars+0x50b/0xa70 getname+0x8e/0xd0 serial8250_handle_irq.part.0+0x3f1/0x4c0 do_sys_openat2+0xf5/0x4c0 serial8250_default_handle_irq+0xb8/0x230 serial8250_interrupt+0xf4/0x1a0 __handle_irq_event_percpu+0x20f/0x820 handle_irq_event+0xa7/0x1e0 handle_edge_irq+0x262/0xd10 __common_interrupt+0x92/0x1d0 common_interrupt+0x9f/0xc0 __x64_sys_openat+0x13f/0x1f0 asm_common_interrupt+0x1e/0x40 default_idle+0xb/0x10 default_idle_call+0x80/0xc0 do_syscall_64+0x3b/0x90 do_idle+0x3b9/0x530 cpu_startup_entry+0x14/0x20 entry_SYSCALL_64_after_hwframe+0x44/0xae secondary_startup_64_no_verify+0xe0/0xeb RIP: 0033:0x7f6980540a04 -> #1 (&port_lock_key){-.-.}-{2:2} Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 : RSP: 002b:00007f697db03060 EFLAGS: 00000293 _raw_spin_lock_irqsave+0x39/0x50 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f69806a0f60 RCX: 00007f6980540a04 serial8250_console_write+0x90e/0xb20 RDX: 0000000000000000 RSI: 00007f697db030f0 RDI: 00000000ffffff9c RBP: 00007f697db030f0 R08: 0000000000000000 R09: 00007f697db02f70 console_unlock+0x8c7/0xd40 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffe6765391f R14: 00007f697db03300 R15: 0000000000022000 register_console+0x378/0x7d0 univ8250_console_init+0x3a/0x46 console_init+0x3c1/0x58d start_kernel+0x301/0x4ee secondary_startup_64_no_verify+0xe0/0xeb -> #0 (console_owner){-.-.}-{0:0}: __lock_acquire+0x2c2f/0x6120 lock_acquire+0x1a2/0x530 vprintk_emit+0x353/0x550 vprintk+0x80/0x90 _printk+0xba/0xed should_fail+0x472/0x5a0 should_failslab+0x5/0x10 __kmalloc+0x72/0x440 tty_buffer_alloc+0x23f/0x2a0 __tty_buffer_request_room+0x156/0x2a0 tty_insert_flip_string_fixed_flag+0x91/0x240 pty_write+0x11c/0x1e0 tty_send_xchar+0x25b/0x370 n_tty_ioctl_helper+0x179/0x2d0 n_tty_ioctl+0x4b/0x360 tty_ioctl+0x860/0x1700 __x64_sys_ioctl+0x196/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &port->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port->lock); lock(&port_lock_key); lock(&port->lock); lock(console_owner); *** DEADLOCK *** 4 locks held by syz-executor.4/14534: #0: ffff888010130098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 #1: ffff888010130130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_send_xchar+0x1a6/0x370 #2: ffff8880101302e8 (&tty->termios_rwsem){++++}-{3:3}, at: tty_send_xchar+0x1ef/0x370 #3: ffff888018785158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 stack backtrace: CPU: 0 PID: 14534 Comm: syz-executor.4 Not tainted 5.18.0-rc2-next-20220414 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 check_noncircular+0x25f/0x2e0 __lock_acquire+0x2c2f/0x6120 lock_acquire+0x1a2/0x530 vprintk_emit+0x353/0x550 vprintk+0x80/0x90 _printk+0xba/0xed should_fail+0x472/0x5a0 should_failslab+0x5/0x10 __kmalloc+0x72/0x440 tty_buffer_alloc+0x23f/0x2a0 __tty_buffer_request_room+0x156/0x2a0 tty_insert_flip_string_fixed_flag+0x91/0x240 pty_write+0x11c/0x1e0 tty_send_xchar+0x25b/0x370 n_tty_ioctl_helper+0x179/0x2d0 n_tty_ioctl+0x4b/0x360 tty_ioctl+0x860/0x1700 __x64_sys_ioctl+0x196/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5b0410bb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5b01681188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5b0421ef60 RCX: 00007f5b0410bb19 RDX: 0000000000000002 RSI: 000000000000540a RDI: 0000000000000003 RBP: 00007f5b016811d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc3fe0d6ff R14: 00007f5b01681300 R15: 0000000000022000 CPU: 0 PID: 14534 Comm: syz-executor.4 Not tainted 5.18.0-rc2-next-20220414 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 should_fail.cold+0x5/0xa should_failslab+0x5/0x10 __kmalloc+0x72/0x440 tty_buffer_alloc+0x23f/0x2a0 __tty_buffer_request_room+0x156/0x2a0 tty_insert_flip_string_fixed_flag+0x91/0x240 pty_write+0x11c/0x1e0 tty_send_xchar+0x25b/0x370 n_tty_ioctl_helper+0x179/0x2d0 n_tty_ioctl+0x4b/0x360 tty_ioctl+0x860/0x1700 __x64_sys_ioctl+0x196/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5b0410bb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5b01681188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5b0421ef60 RCX: 00007f5b0410bb19 RDX: 0000000000000002 RSI: 000000000000540a RDI: 0000000000000003 RBP: 00007f5b016811d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc3fe0d6ff R14: 00007f5b01681300 R15: 0000000000022000 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 14636 Comm: syz-executor.5 Not tainted 5.18.0-rc2-next-20220414 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 should_fail.cold+0x5/0xa should_failslab+0x5/0x10 kmem_cache_alloc+0x5b/0x480 create_object.isra.0+0x3a/0xa20 kmem_cache_alloc+0x239/0x480 getname_flags.part.0+0x50/0x4f0 getname+0x8e/0xd0 do_sys_openat2+0xf5/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6980540a04 Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 RSP: 002b:00007f697db03060 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f69806a0f60 RCX: 00007f6980540a04 RDX: 0000000000000000 RSI: 00007f697db030f0 RDI: 00000000ffffff9c RBP: 00007f697db030f0 R08: 0000000000000000 R09: 00007f697db02f70 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffe6765391f R14: 00007f697db03300 R15: 0000000000022000 9pnet_fd: Insufficient options for proto=fd loop0: detected capacity change from 0 to 256 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 14650 Comm: syz-executor.4 Not tainted 5.18.0-rc2-next-20220414 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 should_fail.cold+0x5/0xa should_failslab+0x5/0x10 kmem_cache_alloc+0x5b/0x480 create_object.isra.0+0x3a/0xa20 __kmalloc+0x25b/0x440 tty_buffer_alloc+0x23f/0x2a0 __tty_buffer_request_room+0x156/0x2a0 tty_insert_flip_string_fixed_flag+0x91/0x240 pty_write+0x11c/0x1e0 tty_send_xchar+0x25b/0x370 n_tty_ioctl_helper+0x179/0x2d0 n_tty_ioctl+0x4b/0x360 tty_ioctl+0x860/0x1700 __x64_sys_ioctl+0x196/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5b0410bb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5b01681188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5b0421ef60 RCX: 00007f5b0410bb19 RDX: 0000000000000002 RSI: 000000000000540a RDI: 0000000000000003 RBP: 00007f5b016811d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc3fe0d6ff R14: 00007f5b01681300 R15: 0000000000022000 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) 9pnet_fd: Insufficient options for proto=fd 9pnet_fd: Insufficient options for proto=fd FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 14770 Comm: syz-executor.5 Not tainted 5.18.0-rc2-next-20220414 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 should_fail.cold+0x5/0xa strncpy_from_user+0x34/0x3d0 getname_flags.part.0+0x95/0x4f0 getname+0x8e/0xd0 do_sys_openat2+0xf5/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6980540a04 Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 RSP: 002b:00007f697db03060 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f69806a0f60 RCX: 00007f6980540a04 RDX: 0000000000000000 RSI: 00007f697db030f0 RDI: 00000000ffffff9c RBP: 00007f697db030f0 R08: 0000000000000000 R09: 00007f697db02f70 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffe6765391f R14: 00007f697db03300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 44 89 54 24 0c mov %r10d,0xc(%rsp) b: e8 96 f9 ff ff callq 0xfffff9a6 10: 44 8b 54 24 0c mov 0xc(%rsp),%r10d 15: 44 89 e2 mov %r12d,%edx 18: 48 89 ee mov %rbp,%rsi 1b: 41 89 c0 mov %eax,%r8d 1e: bf 9c ff ff ff mov $0xffffff9c,%edi 23: b8 01 01 00 00 mov $0x101,%eax 28: 0f 05 syscall * 2a: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 34 ja 0x66 32: 44 89 c7 mov %r8d,%edi 35: 89 44 24 0c mov %eax,0xc(%rsp) 39: e8 c8 f9 ff ff callq 0xfffffa06 3e: 8b .byte 0x8b 3f: 44 rex.R