================================ WARNING: inconsistent lock state 6.0.0-rc5-syzkaller-00094-ga335366bad13 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. udevd/3133 [HC1[1]:SC1[1]:HE0:SE0] takes: ffff888024a7fc18 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff888024a7fc18 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff888024a7fc18 (&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: 19660541 hardirqs last enabled at (19660540): [] __do_softirq+0x190/0x9c6 kernel/softirq.c:555 hardirqs last disabled at (19660541): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (19659284): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (19659284): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (19660539): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (19660539): [] __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 udevd/3133: #0: ffff8880485c8020 (&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-rc5-syzkaller-00094-ga335366bad13 #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 ff f7 bf 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: 00000206 RAX: 00000000ffffffff RBX: ffff88801e528040 RCX: 1ffffffff1bbc1a9 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffff8880125221c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f50e017 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000202 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:from_kuid_munged+0x0/0x130 kernel/user_namespace.c:448 Code: 00 48 8b 4c 24 58 65 48 2b 0c 25 28 00 00 00 75 10 48 83 c4 60 5b 5d 41 5c c3 e8 1b 90 4f 00 eb c2 e8 f4 99 08 08 0f 1f 40 00 <41> 54 49 89 fc 55 48 bd 00 00 00 00 00 fc ff df 53 48 83 ec 60 48 RSP: 0018:ffffc90002e77c98 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90002e77e18 RCX: 0000000000000000 RDX: 1ffff920005cefc9 RSI: 0000000000000000 RDI: ffffffff8be42c20 RBP: 1ffff920005cef94 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000008c07c R12: 00007ffe672be7b0 R13: ffff88801e528040 R14: 00007fd4a11bb75a R15: 0000000000001000 cp_new_stat+0x1ff/0x5b0 fs/stat.c:377 __do_sys_newfstatat+0x104/0x110 fs/stat.c:428 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: 0033:0x7fd4a11251da Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 69 fc 0c 00 f7 RSP: 002b:00007ffe672be7a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00005569ca0b0890 RCX: 00007fd4a11251da RDX: 00007ffe672be7b0 RSI: 00007fd4a11bb75a RDI: 000000000000000f RBP: 000000000000000f R08: 0000000000090800 R09: 00005569ca0c0820 R10: 0000000000001000 R11: 0000000000000206 R12: 00007ffe672be7b0 R13: 00000000000000fd R14: 00007ffe672be8a0 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 ff f7 bf ff callq 0xffbff814 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