================================ WARNING: inconsistent lock state 6.0.0-rc6-syzkaller-00009-g60891ec99e14 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.1/4960 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880007f2018 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff8880007f2018 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff8880007f2018 (&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: 40790 hardirqs last enabled at (40789): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (40789): [] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (40790): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (39448): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (39448): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (39329): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (39329): [] __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.1/4960: #0: ffff888043199580 (&u->iolock){+.+.}-{3:3}, at: __unix_dgram_recvmsg+0x226/0xb80 net/unix/af_unix.c:2404 #1: ffff88801bf84020 (&chan->lock#2){-...}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 4960 Comm: syz-executor.1 Not tainted 6.0.0-rc6-syzkaller-00009-g60891ec99e14 #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:trace_skb_copy_datagram_iovec include/trace/events/skb.h:71 [inline] RIP: 0010:skb_copy_datagram_iter+0x1c2/0x2c0 net/core/datagram.c:526 Code: e9 81 fe ff ff e8 9e b0 29 fa 65 ff 05 e7 16 b0 78 48 c7 c0 60 fa cd 8d 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 <0f> 85 d8 00 00 00 48 8b 05 e1 a1 7b 06 e8 9c 50 13 fa 31 ff 89 c3 RSP: 0018:ffffc90029c977f8 EFLAGS: 00000246 RAX: 1ffffffff1b9bf4c RBX: 0000000000000001 RCX: ffffc9000c432000 RDX: dffffc0000000000 RSI: ffffffff87525852 RDI: 0000000000000001 RBP: ffff8880771e57c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc90029c97d70 R15: 0000000000000000 skb_copy_datagram_msg include/linux/skbuff.h:3900 [inline] __unix_dgram_recvmsg+0x3ff/0xb80 net/unix/af_unix.c:2446 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:415 [inline] __se_compat_sys_recvmmsg_time32 net/compat.c:411 [inline] __ia32_compat_sys_recvmmsg_time32+0xc2/0x160 net/compat.c:411 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: 0023:0xf7f1c549 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:00000000f7ef65cc 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: e9 81 fe ff ff jmpq 0xfffffe86 5: e8 9e b0 29 fa callq 0xfa29b0a8 a: 65 ff 05 e7 16 b0 78 incl %gs:0x78b016e7(%rip) # 0x78b016f8 11: 48 c7 c0 60 fa cd 8d mov $0xffffffff8dcdfa60,%rax 18: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 1f: fc ff df 22: 48 c1 e8 03 shr $0x3,%rax 26: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) * 2a: 0f 85 d8 00 00 00 jne 0x108 <-- trapping instruction 30: 48 8b 05 e1 a1 7b 06 mov 0x67ba1e1(%rip),%rax # 0x67ba218 37: e8 9c 50 13 fa callq 0xfa1350d8 3c: 31 ff xor %edi,%edi 3e: 89 c3 mov %eax,%ebx