================================ WARNING: inconsistent lock state 6.0.0-rc6-syzkaller-00009-g60891ec99e14 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. udevd/4757 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880225ed818 (&clnt->lock){?.+.}-{2:2}, at: p9_tag_remove net/9p/client.c:367 [inline] ffff8880225ed818 (&clnt->lock){?.+.}-{2:2}, at: p9_req_put net/9p/client.c:375 [inline] ffff8880225ed818 (&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: 6498772 hardirqs last enabled at (6498771): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (6498771): [] read_seqbegin include/linux/seqlock.h:836 [inline] hardirqs last enabled at (6498771): [] zone_span_seqbegin include/linux/memory_hotplug.h:141 [inline] hardirqs last enabled at (6498771): [] page_outside_zone_boundaries mm/page_alloc.c:644 [inline] hardirqs last enabled at (6498771): [] bad_range+0x25c/0x330 mm/page_alloc.c:671 hardirqs last disabled at (6498772): [] common_interrupt+0x11/0xc0 arch/x86/kernel/irq.c:240 softirqs last enabled at (6497416): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (6497416): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (6497313): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (6497313): [] __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 *** 1 lock held by udevd/4757: #0: ffff8880458ec020 (&chan->lock#2){-...}-{2:2}, at: req_done+0xcf/0x2e0 net/9p/trans_virtio.c:139 stack backtrace: CPU: 0 PID: 4757 Comm: udevd 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:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:stack_trace_save+0x7e/0xc0 kernel/stacktrace.c:122 Code: 00 48 89 44 24 78 31 c0 48 89 7c 24 20 48 c7 c7 e0 f7 69 81 89 74 24 28 48 8d 74 24 20 89 54 24 2c 48 c7 44 24 30 00 00 00 00 <65> 48 8b 14 25 80 6f 02 00 e8 64 35 c4 ff 8b 44 24 30 48 c7 03 00 RSP: 0018:ffffc900052177c8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: fffff52000a42ef9 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffc900052177e8 RDI: ffffffff8169f7e0 RBP: ffffc90005217878 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000140cc0 R13: dffffc0000000000 R14: ffff88807ffd6700 R15: ffffea0001d6c300 save_stack+0x151/0x1e0 mm/page_owner.c:127 __set_page_owner+0x2e/0x50 mm/page_owner.c:192 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 fallback_alloc+0x1e2/0x2d0 mm/slab.c:3112 __do_cache_alloc mm/slab.c:3253 [inline] slab_alloc mm/slab.c:3287 [inline] __kmem_cache_alloc_lru mm/slab.c:3471 [inline] kmem_cache_alloc+0x30d/0x520 mm/slab.c:3491 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:320 vfs_fstatat+0x73/0xb0 fs/stat.c:254 __do_sys_newfstatat+0x91/0x110 fs/stat.c:425 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 RIP: 0033:0x7f5a1e9251da Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 69 fc 0c 00 f7 RSP: 002b:00007ffd14e4dbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f5a1e9251da RDX: 00007ffd14e4dbf8 RSI: 00007ffd14e4dcc7 RDI: 00000000ffffff9c RBP: 00007ffd14e4ed00 R08: 00000000001fffff R09: 00007ffd14e4ebb0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd14e4ed18 R13: 0000000000000000 R14: 0000000000000008 R15: 000055bb3619b2c0 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: 44 24 78 rex.R and $0x78,%al 6: 31 c0 xor %eax,%eax 8: 48 89 7c 24 20 mov %rdi,0x20(%rsp) d: 48 c7 c7 e0 f7 69 81 mov $0xffffffff8169f7e0,%rdi 14: 89 74 24 28 mov %esi,0x28(%rsp) 18: 48 8d 74 24 20 lea 0x20(%rsp),%rsi 1d: 89 54 24 2c mov %edx,0x2c(%rsp) 21: 48 c7 44 24 30 00 00 movq $0x0,0x30(%rsp) 28: 00 00 * 2a: 65 48 8b 14 25 80 6f mov %gs:0x26f80,%rdx <-- trapping instruction 31: 02 00 33: e8 64 35 c4 ff callq 0xffc4359c 38: 8b 44 24 30 mov 0x30(%rsp),%eax 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: 03 00 add (%rax),%eax