================================ WARNING: inconsistent lock state 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. swapper/1/0 [HC1[1]:SC1[1]:HE0:SE0] takes: ffff8880213a7018 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff8880213a7018 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff8880213a7018 (&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: 1049035 hardirqs last enabled at (1049034): [] __do_softirq+0x190/0x9c6 kernel/softirq.c:555 hardirqs last disabled at (1049035): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (1048996): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (1048996): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (1049033): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (1049033): [] __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 swapper/1/0: #0: ffff888042da0020 (&chan->lock#2){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #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 60 59 eb 89 e8 cf 4a c0 ff 65 66 c7 05 b5 93 43 76 00 00 e8 c0 7d c2 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:ffffc90000538f70 EFLAGS: 00000206 RAX: 00000000ffffffff RBX: ffff888012120000 RCX: 1ffffffff1bbd691 RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000000 RBP: ffff888012158000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f512057 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000082 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:default_idle+0xb/0x10 arch/x86/kernel/process.c:731 Code: f8 e9 8c fd ff ff 4c 89 f7 e8 11 2b 45 f8 e9 3a fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc 66 90 0f 00 2d d7 8a 63 00 fb f4 0f 1f 40 00 41 54 be 08 00 00 00 53 65 48 8b 1c 25 80 6f 02 00 RSP: 0018:ffffc9000046fe00 EFLAGS: 00000242 RAX: 00000000001001c7 RBX: ffff888012120000 RCX: ffffffff89804175 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff88802c934c4b R10: ffffed1005926989 R11: 0000000000000001 R12: ffffed1002424000 R13: 0000000000000001 R14: ffffffff8ddee450 R15: 0000000000000000 default_idle_call+0x80/0xc0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x401/0x590 kernel/sched/idle.c:303 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262 secondary_startup_64_no_verify+0xce/0xdb ---------------- 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 60 59 eb 89 mov $0xffffffff89eb5960,%rdi 10: e8 cf 4a c0 ff callq 0xffc04ae4 15: 65 66 c7 05 b5 93 43 movw $0x0,%gs:0x764393b5(%rip) # 0x764393d4 1c: 76 00 00 1f: e8 c0 7d c2 f7 callq 0xf7c27de4 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