================================ WARNING: inconsistent lock state 6.0.0-syzkaller-03015-g2bca25eaeba6 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. kworker/1:1H/1384 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88802a851018 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff88802a851018 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff88802a851018 (&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: 426196 hardirqs last enabled at (426195): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (426195): [] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 hardirqs last disabled at (426196): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (424038): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (424038): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (424019): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (424019): [] __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 kworker/1:1H/1384: #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888011865138 ((wq_completion)events_highpri){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000756fda8 ((work_completion)(&vmidi->output_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff8880434e8020 (&chan->lock){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 1384 Comm: kworker/1:1H Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events_highpri snd_vmidi_output_work 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:write_comp_data+0x3c/0x90 kernel/kcov.c:229 Code: 01 00 00 49 89 f8 65 48 8b 14 25 80 6f 02 00 a9 00 01 ff 00 74 0e 85 f6 74 59 8b 82 bc 15 00 00 85 c0 74 4f 8b 82 98 15 00 00 <83> f8 03 75 44 48 8b 82 a0 15 00 00 8b 92 9c 15 00 00 48 8b 38 48 RSP: 0018:ffffc9000756fc50 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888042cdcc58 RCX: ffffffff872f738c RDX: ffff88801dedbb00 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000001 R13: ffffc9000756fda8 R14: ffff888014d23c00 R15: ffff888042b65f00 snd_vmidi_output_work+0xbc/0x380 sound/core/seq/seq_virmidi.c:137 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 ---------------- Code disassembly (best guess): 0: 01 00 add %eax,(%rax) 2: 00 49 89 add %cl,-0x77(%rcx) 5: f8 clc 6: 65 48 8b 14 25 80 6f mov %gs:0x26f80,%rdx d: 02 00 f: a9 00 01 ff 00 test $0xff0100,%eax 14: 74 0e je 0x24 16: 85 f6 test %esi,%esi 18: 74 59 je 0x73 1a: 8b 82 bc 15 00 00 mov 0x15bc(%rdx),%eax 20: 85 c0 test %eax,%eax 22: 74 4f je 0x73 24: 8b 82 98 15 00 00 mov 0x1598(%rdx),%eax * 2a: 83 f8 03 cmp $0x3,%eax <-- trapping instruction 2d: 75 44 jne 0x73 2f: 48 8b 82 a0 15 00 00 mov 0x15a0(%rdx),%rax 36: 8b 92 9c 15 00 00 mov 0x159c(%rdx),%edx 3c: 48 8b 38 mov (%rax),%rdi 3f: 48 rex.W