BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 7 scanned by syz-executor.4 (5741) BTRFS warning (device loop1): loop1 checksum verify failed on 5242880 wanted 42BCE6B8 found D53303A6 level 0 BTRFS warning (device loop1): failed to read tree root ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5698 at fs/btrfs/volumes.c:1086 close_fs_devices.part.0.cold+0x11/0x30 fs/btrfs/volumes.c:1086 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5698 Comm: syz-executor.0 Not tainted 4.19.192-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/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:183 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:1086 Code: c7 c7 60 12 a5 88 e8 73 fa f8 ff 0f 0b 49 c7 c4 ea ff ff ff e9 46 11 f7 fa e8 87 e0 68 f9 48 c7 c7 60 12 a5 88 e8 54 fa f8 ff <0f> 0b e9 23 19 f7 fa e8 6f e0 68 f9 48 c7 c7 60 12 a5 88 e8 3c fa RSP: 0018:ffff88803e297600 EFLAGS: 00010282 RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 000000000002f747 RSI: ffffffff814df6b1 RDI: ffffed1007c52eb2 RBP: ffff888091c8c800 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880a585a400 R14: ffff8880973d44e0 R15: ffff88809d22bb00 close_fs_devices fs/btrfs/volumes.c:1113 [inline] btrfs_close_devices+0x95/0x1f0 fs/btrfs/volumes.c:1099 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+0xa3/0x310 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: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: 0033:0x467afa Code: 48 c7 c2 bc 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f19d5ac5fa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f19d5ac6000 RBP: 00007f19d5ac6040 R08: 00007f19d5ac6040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f19d5ac6000 R15: 0000000020000140 Kernel Offset: disabled Rebooting in 86400 seconds..