================================ WARNING: inconsistent lock state 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. udevd/3133 [HC1[1]:SC1[1]:HE0:SE0] takes: ffff88802577f418 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff88802577f418 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff88802577f418 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put+0xc6/0x250 net/9p/client.c:372 {HARDIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] p9_fd_request+0x85/0x330 net/9p/trans_fd.c:672 p9_client_rpc+0x2f0/0xce0 net/9p/client.c:660 p9_client_version net/9p/client.c:880 [inline] p9_client_create+0xaec/0x1070 net/9p/client.c:985 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd irq event stamp: 7673759 hardirqs last enabled at (7673758): [] __do_softirq+0x190/0x9c6 kernel/softirq.c:555 hardirqs last disabled at (7673759): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (7672282): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (7672282): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (7673757): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (7673757): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&clnt->lock); lock(&clnt->lock); *** DEADLOCK *** 2 locks held by udevd/3133: #0: ffffffff8c7c7d48 (tomoyo_ss){....}-{0:0}, at: tomoyo_check_open_permission+0xe8/0x380 security/tomoyo/file.c:761 #1: ffff888022a00020 (&chan->lock#2){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 0 PID: 3133 Comm: udevd Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3961 [inline] valid_state kernel/locking/lockdep.c:3973 [inline] mark_lock_irq kernel/locking/lockdep.c:4176 [inline] mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4632 mark_lock kernel/locking/lockdep.c:4596 [inline] mark_usage kernel/locking/lockdep.c:4524 [inline] __lock_acquire+0x14a2/0x56d0 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 p9_tag_remove net/9p/client.c:367 [inline] p9_req_put net/9p/client.c:375 [inline] p9_req_put+0xc6/0x250 net/9p/client.c:372 req_done+0x1de/0x2e0 net/9p/trans_virtio.c:148 vring_interrupt drivers/virtio/virtio_ring.c:2462 [inline] vring_interrupt+0x29d/0x3d0 drivers/virtio/virtio_ring.c:2437 __handle_irq_event_percpu+0x227/0x870 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250 common_interrupt+0x4d/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640 RIP: 0010:__do_softirq+0x196/0x9c6 kernel/softirq.c:557 Code: 00 48 01 f0 48 89 44 24 18 48 c7 c7 40 43 eb 89 e8 3f 08 c0 ff 65 66 c7 05 35 94 43 76 00 00 e8 f0 ad c1 f7 fb b8 ff ff ff ff <48> c7 c3 c0 a0 c0 8b 41 0f bc c5 41 89 c7 41 83 c7 01 0f 85 ad 00 RSP: 0018:ffffc90000007f70 EFLAGS: 00000202 RAX: 00000000ffffffff RBX: ffff88801a850140 RCX: 1ffffffff1bbc241 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffff8880125221c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f50e017 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:write_comp_data+0x3c/0x90 kernel/kcov.c:229 Code: 01 00 00 49 89 f8 65 48 8b 14 25 80 6f 02 00 a9 00 01 ff 00 74 0e 85 f6 74 59 8b 82 bc 15 00 00 85 c0 74 4f 8b 82 98 15 00 00 <83> f8 03 75 44 48 8b 82 a0 15 00 00 8b 92 9c 15 00 00 48 8b 38 48 RSP: 0018:ffffc90002e77768 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00000000000000b7 RCX: ffffffff83c51816 RDX: ffff88801a850140 RSI: 0000000000000000 RDI: 0000000000000003 RBP: dffffc0000000000 R08: 0000000000000003 R09: 00000000000000ff R10: 00000000000000b7 R11: 000000000008c07c R12: ffffc90002e77860 R13: ffff8880223f4f00 R14: ffff8880223f4f30 R15: 00000000000000b7 tomoyo_check_acl+0x316/0x440 security/tomoyo/domain.c:183 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_permission+0x1ff/0x3a0 security/tomoyo/file.c:573 tomoyo_check_open_permission+0x33e/0x380 security/tomoyo/file.c:777 tomoyo_file_open security/tomoyo/tomoyo.c:320 [inline] tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:315 security_file_open+0x45/0xb0 security/security.c:1646 do_dentry_open+0x349/0x13a0 fs/open.c:867 do_open fs/namei.c:3557 [inline] path_openat+0x1c92/0x28f0 fs/namei.c:3691 do_filp_open+0x1b6/0x400 fs/namei.c:3718 do_sys_openat2+0x16d/0x4c0 fs/open.c:1313 do_sys_open fs/open.c:1329 [inline] __do_sys_openat fs/open.c:1345 [inline] __se_sys_openat fs/open.c:1340 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1340 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f93c1f2a5a4 Code: f9 41 89 f0 41 83 e2 40 75 2c 89 f0 25 00 00 41 00 3d 00 00 41 00 74 1e 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2c c3 0f 1f 00 48 8d 44 24 08 c7 44 24 b8 10 RSP: 002b:00007ffcd3c04d78 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000555f3b57b470 RCX: 00007f93c1f2a5a4 RDX: 0000000000090800 RSI: 0000555f3b578fa0 RDI: 00000000ffffff9c RBP: 0000555f3b592170 R08: 0000000000090800 R09: 0000555f3b578fa0 R10: 0000000000000000 R11: 0000000000000287 R12: 0000555f3b578fa0 R13: 00000000000000ff R14: 00007ffcd3c04dd0 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 00 48 01 add %cl,0x1(%rax) 3: f0 48 89 44 24 18 lock mov %rax,0x18(%rsp) 9: 48 c7 c7 40 43 eb 89 mov $0xffffffff89eb4340,%rdi 10: e8 3f 08 c0 ff callq 0xffc00854 15: 65 66 c7 05 35 94 43 movw $0x0,%gs:0x76439435(%rip) # 0x76439454 1c: 76 00 00 1f: e8 f0 ad c1 f7 callq 0xf7c1ae14 24: fb sti 25: b8 ff ff ff ff mov $0xffffffff,%eax * 2a: 48 c7 c3 c0 a0 c0 8b mov $0xffffffff8bc0a0c0,%rbx <-- trapping instruction 31: 41 0f bc c5 bsf %r13d,%eax 35: 41 89 c7 mov %eax,%r15d 38: 41 83 c7 01 add $0x1,%r15d 3c: 0f .byte 0xf 3d: 85 .byte 0x85 3e: ad lods %ds:(%rsi),%eax