BTRFS warning (device loop2): loop2 checksum verify failed on 5242880 wanted 42BCE6B8 found 922DD78F level 0 BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 7 scanned by syz-executor.3 (14806) BTRFS warning (device loop2): failed to read tree root watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.3:14806] Modules linked in: irq event stamp: 3606293 hardirqs last enabled at (3606292): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3606293): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2358762): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2358765): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2358765): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 14806 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_is_held_type+0x17a/0x210 kernel/locking/lockdep.c:3948 Code: 00 00 00 00 fc ff df c7 85 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 75 63 48 83 3d 45 cc a6 08 00 74 2c 48 89 df 57 9d <0f> 1f 44 00 00 48 83 c4 08 44 89 e0 5b 5d 41 5c c3 48 83 c4 08 41 RSP: 0018:ffff8880ba107a88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: 0000000000000286 RBP: ffff888053596640 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff866fedf1 R14: ffffffff8670b86f R15: ffff88802fb1fa40 FS: 00007f17c3def700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0495193718 CR3: 0000000052333000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:344 [inline] rcu_read_lock_sched_held+0x16c/0x1d0 kernel/rcu/update.c:118 trace_kmem_cache_free include/trace/events/kmem.h:144 [inline] kmem_cache_free+0x226/0x260 mm/slab.c:3768 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] kfree_skb+0x127/0x3d0 net/core/skbuff.c:672 kfree_skb_list+0x3f/0x60 net/core/skbuff.c:681 __dev_xmit_skb net/core/dev.c:3506 [inline] __dev_queue_xmit+0x2973/0x2e00 net/core/dev.c:3807 mrp_queue_xmit net/802/mrp.c:367 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:611 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:lock_is_held_type+0xc/0x210 kernel/locking/lockdep.c:3935 Code: 8b e8 88 ac 4d 00 e9 41 ff ff ff e8 0e ad 4d 00 eb ad 66 66 2e 0f 1f 84 00 00 00 00 00 90 48 b8 00 00 00 00 00 fc ff df 41 54 <55> 48 89 fd 53 65 48 8b 1c 25 c0 df 01 00 48 8d bb 84 08 00 00 48 RSP: 0018:ffff8880a2adf310 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff89f85f20 RBP: ffff8880a2adf3e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888053596640 R13: 000000000002b0c0 R14: ffff8880a2ad8000 R15: ffff8880ba12b0c0 lock_is_held include/linux/lockdep.h:344 [inline] schedule_debug kernel/sched/core.c:3337 [inline] __schedule+0xf7f/0x2040 kernel/sched/core.c:3439 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3641 ___preempt_schedule+0x16/0x18 vprintk_emit+0x302/0x740 kernel/printk/printk.c:1966 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 btrfs_printk+0x388/0x3d0 fs/btrfs/super.c:214 device_list_add.cold+0x177/0x34d fs/btrfs/volumes.c:866 btrfs_scan_one_device+0x33f/0xd00 fs/btrfs/volumes.c:1273 btrfs_mount_root+0x9df/0x1830 fs/btrfs/super.c:1577 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 fs/namespace.c:951 btrfs_mount+0x23a/0xaa0 fs/btrfs/super.c:1681 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f17c547b57a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f17c3deef88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f17c547b57a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f17c3deefe0 RBP: 00007f17c3def020 R08: 00007f17c3def020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f17c3deefe0 R15: 0000000020000a40 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8110 Comm: syz-fuzzer Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x41383a Code: 48 89 c1 48 8b 6c 24 28 48 83 c4 30 c3 31 c0 48 89 d3 48 89 c1 48 8b 6c 24 28 48 83 c4 30 c3 90 48 8b 72 68 4c 29 c0 8b 4a 5c <48> 0f af c8 48 c1 e9 20 48 0f af f1 4a 8d 04 06 48 89 d3 48 8b 6c RSP: 002b:000000c00003de48 EFLAGS: 00000202 RAX: 0000000000001880 RBX: 000000c0254ed9a0 RCX: 0000000008000000 RDX: 00007f6652ee9998 RSI: 0000000000000020 RDI: 0000000000832170 RBP: 000000c00003de70 R08: 000000c0254ec000 R09: 00007f6652ccc6cd R10: fffffffffffffee0 R11: 00007f6652e24fff R12: 000000c0254ed9a0 R13: 000000c0254ed880 R14: 000000c0002ae340 R15: 000000a6826df43e FS: 000000c0004bf090 GS: 0000000000000000 ---------------- Code disassembly (best guess), 6 bytes skipped: 0: df c7 ffreep %st(7) 2: 85 84 08 00 00 00 00 test %eax,0x0(%rax,%rcx,1) 9: 00 00 add %al,(%rax) b: 48 c1 e8 03 shr $0x3,%rax f: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 13: 75 63 jne 0x78 15: 48 83 3d 45 cc a6 08 cmpq $0x0,0x8a6cc45(%rip) # 0x8a6cc62 1c: 00 1d: 74 2c je 0x4b 1f: 48 89 df mov %rbx,%rdi 22: 57 push %rdi 23: 9d popfq * 24: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 29: 48 83 c4 08 add $0x8,%rsp 2d: 44 89 e0 mov %r12d,%eax 30: 5b pop %rbx 31: 5d pop %rbp 32: 41 5c pop %r12 34: c3 retq 35: 48 83 c4 08 add $0x8,%rsp 39: 41 rex.B