bisecting fixing commit since fb683b5e3f53a73e761952735736180939a313df
building syzkaller on 101194ebf6834198300032f6fb438f2c4cdf0401
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: b8e01d858ebfd9a9f2bfa43e427c29ecb77722627f5cd7ed3ca5b57dddfbfca9
all runs: crashed: kernel BUG at fs/btrfs/volumes.c:LINE!
testing current HEAD 13af6c74b14a883366e7702c40c52ff548096e7f
testing commit 13af6c74b14a883366e7702c40c52ff548096e7f with gcc (GCC) 8.1.0
kernel signature: 2be582022e3a8eedcc7a09f59852c7636263a50f36e4ef3a95f1f7f26d8297b3
all runs: crashed: kernel BUG at fs/btrfs/volumes.c:LINE!
revisions tested: 2, total time: 25m9.448102929s (build: 18m13.375542529s, test: 5m50.753583362s)
the crash still happens on HEAD
commit msg: Linux 4.19.136
crash: kernel BUG at fs/btrfs/volumes.c:LINE!
RDX: 00007f462f5acae0 RSI: 00000000200001c0 RDI: 00007f462f5acb00
RBP: 000000000075bf20 R08: 00007f462f5acb40 R09: 00007f462f5acae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f462f5ad6d4
R13: 00000000004caca3 R14: 00000000004e41b0 R15: 0000000000000003
------------[ cut here ]------------
kernel BUG at fs/btrfs/volumes.c:1049!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7575 Comm: syz-executor.5 Not tainted 4.19.136-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:1049 [inline]
RIP: 0010:close_fs_devices.part.48+0x4eb/0x7a0 fs/btrfs/volumes.c:1073
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 09 35 e4 fe e9 a7 fb ff ff e8 ff 34 e4 fe
RSP: 0018:ffff88808cab76d8 EFLAGS: 00010202
RAX: fffffffffffffff4 RBX: ffff8880a8d96040 RCX: 0000000000000000
RDX: 1ffffffff10a4161 RSI: ffffffff88590aa0 RDI: 0000000000000282
RBP: ffff88808cab7748 R08: ffffed1015d64733 R09: ffffed1015d64732
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: dffffc0000000000
R13: ffff888095c4d658 R14: ffff8880a8d96060 R15: fffffffffffffff4
FS:  00007f462f5ad700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d4bf8f028 CR3: 00000000905f8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 close_fs_devices fs/btrfs/volumes.c:1105 [inline]
 btrfs_close_devices+0x80/0x1b0 fs/btrfs/volumes.c:1091
 btrfs_mount_root+0xeb4/0x16f0 fs/btrfs/super.c:1619
 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+0x21a/0x12f5 fs/btrfs/super.c:1670
 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:00007f462f5aca68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f462f5acc90 RCX: 000000000045d31a
RDX: 00007f462f5acae0 RSI: 00000000200001c0 RDI: 00007f462f5acb00
RBP: 000000000075bf20 R08: 00007f462f5acb40 R09: 00007f462f5acae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f462f5ad6d4
R13: 00000000004caca3 R14: 00000000004e41b0 R15: 0000000000000003
Modules linked in:
---[ end trace e315ea840786bde4 ]---
RIP: 0010:btrfs_close_one_device fs/btrfs/volumes.c:1049 [inline]
RIP: 0010:close_fs_devices.part.48+0x4eb/0x7a0 fs/btrfs/volumes.c:1073
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 09 35 e4 fe e9 a7 fb ff ff e8 ff 34 e4 fe
RSP: 0018:ffff88808cab76d8 EFLAGS: 00010202
RAX: fffffffffffffff4 RBX: ffff8880a8d96040 RCX: 0000000000000000
RDX: 1ffffffff10a4161 RSI: ffffffff88590aa0 RDI: 0000000000000282
RBP: ffff88808cab7748 R08: ffffed1015d64733 R09: ffffed1015d64732
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: dffffc0000000000
R13: ffff888095c4d658 R14: ffff8880a8d96060 R15: fffffffffffffff4
FS:  00007f462f5ad700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d4bf8f028 CR3: 00000000905f8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400