================================ WARNING: inconsistent lock state 5.19.0-syzkaller-14264-gf6eb0fed6a39 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.3/10062 [HC1[1]:SC1[1]:HE0:SE0] takes: ffff88801ceb8c18 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff88801ceb8c18 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff88801ceb8c18 (&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: 1139 hardirqs last enabled at (1138): [] __do_softirq+0x190/0x9c6 kernel/softirq.c:555 hardirqs last disabled at (1139): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (62): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (62): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (1137): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (1137): [] __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 *** 3 locks held by syz-executor.3/10062: #0: ffff888066ee2ab0 (&p->alloc_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #0: ffff888066ee2ab0 (&p->alloc_lock){+.+.}-{2:2}, at: task_lock include/linux/sched/task.h:174 [inline] #0: ffff888066ee2ab0 (&p->alloc_lock){+.+.}-{2:2}, at: exit_fs+0x5a/0x170 fs/fs_struct.c:101 #1: ffff88801b98ca20 (&fs->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #1: ffff88801b98ca20 (&fs->lock){+.+.}-{2:2}, at: exit_fs+0x62/0x170 fs/fs_struct.c:102 #2: ffff888022720020 (&chan->lock#2){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 0 PID: 10062 Comm: syz-executor.3 Not tainted 5.19.0-syzkaller-14264-gf6eb0fed6a39 #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:2454 [inline] vring_interrupt+0x29d/0x3d0 drivers/virtio/virtio_ring.c:2429 __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 c0 41 eb 89 e8 5f ff be ff 65 66 c7 05 35 94 43 76 00 00 e8 70 ab 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: ffff888066ee2140 RCX: 1ffffffff211cc2e RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffff8880125241c0 R08: 0000000000000001 R09: ffffffff908d9967 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000080 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:lock_acquire+0x1ef/0x570 kernel/locking/lockdep.c:5634 Code: d2 a3 7e 83 f8 01 0f 85 e8 02 00 00 9c 58 f6 c4 02 0f 85 fb 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000357fa48 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920006aff4b RCX: ffffffff815e513e RDX: 1ffff1100cddc576 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff908d9967 R10: fffffbfff211b32c R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88801b98ca20 R15: 0000000000000000 __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] exit_fs+0x62/0x170 fs/fs_struct.c:102 do_exit+0xaa6/0x29b0 kernel/exit.c:791 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x238c/0x2610 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0b07489279 Code: Unable to access opcode bytes at RIP 0x7f0b0748924f. RSP: 002b:00007f0b085a3218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f0b0759bf88 RCX: 00007f0b07489279 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0b0759bf88 RBP: 00007f0b0759bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0b0759bf8c R13: 00007ffdfa1bfd4f R14: 00007f0b085a3300 R15: 0000000000022000 ---------------- 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 c0 41 eb 89 mov $0xffffffff89eb41c0,%rdi 10: e8 5f ff be ff callq 0xffbeff74 15: 65 66 c7 05 35 94 43 movw $0x0,%gs:0x76439435(%rip) # 0x76439454 1c: 76 00 00 1f: e8 70 ab c1 f7 callq 0xf7c1ab94 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