================================ WARNING: inconsistent lock state 6.0.0-rc6-syzkaller-00344-g5e049663f678 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. kworker/u16:2/3738 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88801b848018 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff88801b848018 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff88801b848018 (&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: 33363488 hardirqs last enabled at (33363487): [] preempt_schedule_irq+0x43/0x90 kernel/sched/core.c:6805 hardirqs last disabled at (33363488): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (33363480): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (33363480): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (33363451): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (33363451): [] __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 *** 4 locks held by kworker/u16:2/3738: #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880119c6938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc90004907da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffffffff8d79d910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb00 net/core/net_namespace.c:557 #3: ffff88801bba4020 (&chan->lock#2){-.-.}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 1 PID: 3738 Comm: kworker/u16:2 Not tainted 6.0.0-rc6-syzkaller-00344-g5e049663f678 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: netns cleanup_net 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_irq+0x49/0x90 kernel/sched/core.c:6806 Code: 55 53 65 48 8b 1c 25 80 6f 02 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 d2 bd d0 f7 e8 bd 6f 00 f8 fb bf 01 00 00 00 92 a0 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 70 a8 d0 RSP: 0018:ffffc90004907a78 EFLAGS: 00000202 RAX: 0000000001fd161f RBX: ffff88801cae5880 RCX: 1ffffffff211d4ce RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffed100395cb10 R08: 0000000000000001 R09: ffffffff908e594f R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x31/0x80 kernel/entry/common.c:428 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:654 RIP: 0010:inet_twsk_purge+0x97/0x850 net/ipv4/inet_timewait_sock.c:267 Code: 00 00 00 31 c0 e8 79 95 a0 f9 48 8d 43 10 48 c1 eb 03 48 89 44 24 38 48 89 d8 4c 01 f8 c7 44 24 2c 00 00 00 00 48 89 44 24 40 54 95 a0 f9 48 8b 44 24 40 80 38 00 0f 85 8a 07 00 00 48 8b 44 RSP: 0018:ffffc90004907b40 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 000000000007ffff RCX: ffffffff87db78bf RDX: ffff88801cae5880 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000013422 R08: 0000000000000004 R09: 000000000007ffff R10: 0000000000013422 R11: 1ffffffff17f2741 R12: ffffffff8da9d280 R13: ffffc90004907ca0 R14: 000000000000000a R15: dffffc0000000000 ops_exit_list+0x125/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 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: 55 push %rbp 1: 53 push %rbx 2: 65 48 8b 1c 25 80 6f mov %gs:0x26f80,%rbx 9: 02 00 b: 48 89 dd mov %rbx,%rbp e: 48 c1 ed 03 shr $0x3,%rbp 12: 48 01 c5 add %rax,%rbp 15: bf 01 00 00 00 mov $0x1,%edi 1a: e8 d2 bd d0 f7 callq 0xf7d0bdf1 1f: e8 bd 6f 00 f8 callq 0xf8006fe1 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 92 a0 ff ff callq 0xffffa0c1 <-- trapping instruction 2f: 9c pushfq 30: 58 pop %rax 31: fa cli 32: f6 c4 02 test $0x2,%ah 35: 75 27 jne 0x5e 37: bf 01 00 00 00 mov $0x1,%edi 3c: e8 .byte 0xe8 3d: 70 a8 jo 0xffffffe7 3f: d0 .byte 0xd0