BTRFS warning (device ): duplicate device /dev/loop0 devid 1912602624 generation 7 scanned by syz-executor929 (8704) BTRFS error (device loop3): bad tree block start, want 5242880 have 0 BTRFS warning (device loop3): failed to read tree root ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8691 at fs/btrfs/volumes.c:1080 close_fs_devices.part.0.cold+0x11/0x30 fs/btrfs/volumes.c:1080 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8691 Comm: syz-executor929 Not tainted 4.19.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x61 kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:close_fs_devices.part.0.cold+0x11/0x30 fs/btrfs/volumes.c:1080 Code: c7 c7 a0 f3 a4 88 e8 aa b2 56 fe 0f 0b 49 c7 c4 ea ff ff ff e9 d7 06 ff ff e8 08 b9 6b fe 48 c7 c7 a0 f3 a4 88 e8 8b b2 56 fe <0f> 0b e9 b4 0e ff ff e8 f0 b8 6b fe 48 c7 c7 a0 f3 a4 88 e8 73 b2 RSP: 0018:ffff8880a2cb7600 EFLAGS: 00010282 RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814fdb91 RDI: ffffed1014596eb2 RBP: ffff8880b333fd40 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880aac93700 R14: ffff888091fb1b60 R15: ffff88809ff2d200 close_fs_devices fs/btrfs/volumes.c:1107 [inline] btrfs_close_devices+0x95/0x1f0 fs/btrfs/volumes.c:1093 open_ctree+0x26b/0x61e0 fs/btrfs/disk-io.c:3326 btrfs_fill_super fs/btrfs/super.c:1209 [inline] btrfs_mount_root+0x12e5/0x1830 fs/btrfs/super.c:1613 mount_fs+0xa3/0x30c 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/0xa93 fs/btrfs/super.c:1681 mount_fs+0xa3/0x30c 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:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44863a Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd a2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 aa a2 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffd8f719b08 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd8f719b80 RCX: 000000000044863a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd8f719b40 RBP: 0000000000000004 R08: 00007ffd8f719b80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 00007ffd8f719b40 R14: 0000000000000003 R15: 0000000000000001 Kernel Offset: disabled Rebooting in 86400 seconds..