bisecting fixing commit since fb683b5e3f53a73e761952735736180939a313df
building syzkaller on 101194ebf6834198300032f6fb438f2c4cdf0401
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: 516e02acb7a5d77d6f5f4fc36eb87ef2ab82269409dbe883dfe7f542966838f5
all runs: crashed: kernel BUG at fs/btrfs/volumes.c:LINE!
testing current HEAD b09c34517e1ac4018e3bb75ed5c8610a8a1f486b
testing commit b09c34517e1ac4018e3bb75ed5c8610a8a1f486b with gcc (GCC) 8.1.0
kernel signature: 95950c618b3bcdeaba7933c6b666b2ebb6d1c1c1e946ca8505c24e2ef40e66ce
all runs: crashed: kernel BUG at fs/btrfs/volumes.c:LINE!
revisions tested: 2, total time: 25m8.86472209s (build: 17m39.641976741s, test: 6m39.83216769s)
the crash still happens on HEAD
commit msg: Linux 4.19.149
crash: kernel BUG at fs/btrfs/volumes.c:LINE!
RDX: 00007f559aa46ae0 RSI: 00000000200001c0 RDI: 00007f559aa46b00
RBP: 000000000075bf20 R08: 00007f559aa46b40 R09: 00007f559aa46ae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f559aa476d4
R13: 00000000004caca3 R14: 00000000004e41b0 R15: 0000000000000003
------------[ cut here ]------------
kernel BUG at fs/btrfs/volumes.c:1060!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7622 Comm: syz-executor.0 Not tainted 4.19.149-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:btrfs_close_one_device fs/btrfs/volumes.c:1060 [inline]
RIP: 0010:close_fs_devices.part.48+0x4eb/0x7a0 fs/btrfs/volumes.c:1084
Code: 0f 85 9e 01 00 00 48 8d 7a 30 4c 89 43 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 6a 01 00 00 48 83 6a 30 01 e9 45 fc ff ff <0f> 0b 0f 0b 4c 89 f7 e8 39 12 e4 fe e9 a7 fb ff ff e8 2f 12 e4 fe
RSP: 0018:ffff8880811cf788 EFLAGS: 00010202
RAX: fffffffffffffff4 RBX: ffff888096650dc0 RCX: 0000000000000000
RDX: 1ffffffff10a4169 RSI: ffffffff88590ae0 RDI: 0000000000000282
RBP: ffff8880811cf7f8 R08: ffffed1015d44733 R09: ffffed1015d44732
R10: ffffed1015d44732 R11: ffff8880aea23993 R12: dffffc0000000000
R13: ffff888094f74e18 R14: ffff888096650de0 R15: fffffffffffffff4
FS:  00007f559aa47700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008e5a7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 close_fs_devices fs/btrfs/volumes.c:1116 [inline]
 btrfs_close_devices+0x80/0x1b0 fs/btrfs/volumes.c:1102
 btrfs_mount_root+0xeb4/0x16f0 fs/btrfs/super.c:1630
 mount_fs+0x7f/0x2a2 fs/super.c:1261
 vfs_kern_mount.part.34+0x58/0x3d0 fs/namespace.c:961
 vfs_kern_mount+0xe/0x20 fs/namespace.c:947
 btrfs_mount+0x219/0xbd3 fs/btrfs/super.c:1681
 mount_fs+0x7f/0x2a2 fs/super.c:1261
 vfs_kern_mount.part.34+0x58/0x3d0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x36e/0x2410 fs/namespace.c:2799
 ksys_mount+0xba/0xe0 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d31a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd 8b 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 8b fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f559aa46a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f559aa46c90 RCX: 000000000045d31a
RDX: 00007f559aa46ae0 RSI: 00000000200001c0 RDI: 00007f559aa46b00
RBP: 000000000075bf20 R08: 00007f559aa46b40 R09: 00007f559aa46ae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f559aa476d4
R13: 00000000004caca3 R14: 00000000004e41b0 R15: 0000000000000003
Modules linked in:
---[ end trace 196eeb4d3fc704cf ]---
RIP: 0010:btrfs_close_one_device fs/btrfs/volumes.c:1060 [inline]
RIP: 0010:close_fs_devices.part.48+0x4eb/0x7a0 fs/btrfs/volumes.c:1084
Code: 0f 85 9e 01 00 00 48 8d 7a 30 4c 89 43 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 6a 01 00 00 48 83 6a 30 01 e9 45 fc ff ff <0f> 0b 0f 0b 4c 89 f7 e8 39 12 e4 fe e9 a7 fb ff ff e8 2f 12 e4 fe
RSP: 0018:ffff8880811cf788 EFLAGS: 00010202
RAX: fffffffffffffff4 RBX: ffff888096650dc0 RCX: 0000000000000000
RDX: 1ffffffff10a4169 RSI: ffffffff88590ae0 RDI: 0000000000000282
RBP: ffff8880811cf7f8 R08: ffffed1015d44733 R09: ffffed1015d44732
R10: ffffed1015d44732 R11: ffff8880aea23993 R12: dffffc0000000000
R13: ffff888094f74e18 R14: ffff888096650de0 R15: fffffffffffffff4
FS:  00007f559aa47700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0ad062c8 CR3: 000000008e5a7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400