================================ WARNING: inconsistent lock state 6.0.0-rc7-syzkaller-00250-ga962b54e162c #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.1/10352 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88801e790c18 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff88801e790c18 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff88801e790c18 (&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: 15384 hardirqs last enabled at (15383): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (15383): [] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (15384): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (15226): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (15226): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (15215): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (15215): [] __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 syz-executor.1/10352: #0: ffff88801b8cfd80 (&u->iolock){+.+.}-{3:3}, at: __unix_dgram_recvmsg+0x226/0xb80 net/unix/af_unix.c:2404 #1: ffff88801a5f0020 (&chan->lock){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 10352 Comm: syz-executor.1 Not tainted 6.0.0-rc7-syzkaller-00250-ga962b54e162c #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+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640 RIP: 0010:preempt_schedule+0x7/0x20 kernel/sched/core.c:6685 Code: ff 45 31 ed e8 0a c1 dd f7 eb d6 48 89 df e8 d0 68 46 f8 eb ad e8 49 69 46 f8 eb da 0f 1f 80 00 00 00 00 65 8b 05 79 68 80 76 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 e9 25 ff ff ff 0f 1f RSP: 0018:ffffc90004b9f6d0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc90004b9f720 R08: 0000000000000001 R09: ffffffff908e59f7 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000010 R14: 0000000000000001 R15: 0000000000000246 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x57/0x70 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline] __wake_up_common_lock+0xde/0x130 kernel/sched/wait.c:139 __unix_dgram_recvmsg+0x2cd/0xb80 net/unix/af_unix.c:2434 unix_dgram_recvmsg+0xc0/0xe0 net/unix/af_unix.c:2504 sock_recvmsg_nosec net/socket.c:995 [inline] ____sys_recvmsg+0x536/0x600 net/socket.c:2699 ___sys_recvmsg+0xf2/0x180 net/socket.c:2743 do_recvmmsg+0x554/0x6e0 net/socket.c:2829 __sys_recvmmsg+0x23e/0x250 net/socket.c:2916 __do_compat_sys_recvmmsg_time32 net/compat.c:416 [inline] __se_compat_sys_recvmmsg_time32 net/compat.c:412 [inline] __ia32_compat_sys_recvmmsg_time32+0xc2/0x160 net/compat.c:412 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 RIP: 0023:0xf7f35549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f0f5cc EFLAGS: 00000296 ORIG_RAX: 0000000000000151 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 RDX: 0000000000010106 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: ff 45 31 incl 0x31(%rbp) 3: ed in (%dx),%eax 4: e8 0a c1 dd f7 callq 0xf7ddc113 9: eb d6 jmp 0xffffffe1 b: 48 89 df mov %rbx,%rdi e: e8 d0 68 46 f8 callq 0xf84668e3 13: eb ad jmp 0xffffffc2 15: e8 49 69 46 f8 callq 0xf8466963 1a: eb da jmp 0xfffffff6 1c: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 23: 65 8b 05 79 68 80 76 mov %gs:0x76806879(%rip),%eax # 0x768068a3 * 2a: a9 ff ff ff 7f test $0x7fffffff,%eax <-- trapping instruction 2f: 74 01 je 0x32 31: c3 retq 32: 9c pushfq 33: 58 pop %rax 34: f6 c4 02 test $0x2,%ah 37: 74 f8 je 0x31 39: e9 25 ff ff ff jmpq 0xffffff63 3e: 0f .byte 0xf 3f: 1f (bad)