================================ WARNING: inconsistent lock state 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.2/8723 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888024e36018 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff888024e36018 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff888024e36018 (&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] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 irq event stamp: 6168 hardirqs last enabled at (6167): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 hardirqs last disabled at (6168): [] irqentry_enter+0x45/0x50 kernel/entry/common.c:319 softirqs last enabled at (6156): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (6156): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (6053): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (6053): [] __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 *** 1 lock held by syz-executor.2/8723: #0: ffff88801c1a8020 (&chan->lock#2){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 8723 Comm: syz-executor.2 Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #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: 0023:0xf6e1f0db Code: 55 f8 39 3c 24 89 54 24 08 89 f2 19 da 72 5c 83 e8 08 89 da 39 cf 1b 54 24 04 73 24 89 74 24 04 8d b4 26 00 00 00 00 8b 48 f8 <8b> 50 fc 83 e8 08 89 de 39 cf 19 d6 72 ef 8b 74 24 04 89 54 24 04 RSP: 002b:00000000ffc74130 EFLAGS: 00000297 RAX: 00000000f6dcdfa8 RBX: 00000000ffffffff RCX: 000000008424697d RDX: 00000000ffffffff RSI: 00000000ffffffff RDI: 000000008424697d RBP: 00000000f6dcdf38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 55 push %rbp 1: f8 clc 2: 39 3c 24 cmp %edi,(%rsp) 5: 89 54 24 08 mov %edx,0x8(%rsp) 9: 89 f2 mov %esi,%edx b: 19 da sbb %ebx,%edx d: 72 5c jb 0x6b f: 83 e8 08 sub $0x8,%eax 12: 89 da mov %ebx,%edx 14: 39 cf cmp %ecx,%edi 16: 1b 54 24 04 sbb 0x4(%rsp),%edx 1a: 73 24 jae 0x40 1c: 89 74 24 04 mov %esi,0x4(%rsp) 20: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 27: 8b 48 f8 mov -0x8(%rax),%ecx * 2a: 8b 50 fc mov -0x4(%rax),%edx <-- trapping instruction 2d: 83 e8 08 sub $0x8,%eax 30: 89 de mov %ebx,%esi 32: 39 cf cmp %ecx,%edi 34: 19 d6 sbb %edx,%esi 36: 72 ef jb 0x27 38: 8b 74 24 04 mov 0x4(%rsp),%esi 3c: 89 54 24 04 mov %edx,0x4(%rsp)