bisecting fixing commit since daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b
building syzkaller on eff43e99da12c6de1965548a619c3013b8ee791e
testing commit daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b with gcc (GCC) 8.1.0
kernel signature: 855bd4fd9fa2832e35b3d4031a3dada923f1a01a6b31ea6b62e58c853aa726f0
run #0: crashed: general protection fault in corrupted
run #1: crashed: general protection fault in mount_fs
run #2: crashed: general protection fault in mount_fs
run #3: crashed: general protection fault in mount_fs
run #4: crashed: general protection fault in mount_fs
run #5: crashed: general protection fault in mount_fs
run #6: crashed: general protection fault in corrupted
run #7: crashed: general protection fault in mount_fs
run #8: crashed: general protection fault in mount_fs
run #9: crashed: general protection fault in mount_fs
testing current HEAD 3207316b3beec7e38e5dbe2f463df0cec71e0b97
testing commit 3207316b3beec7e38e5dbe2f463df0cec71e0b97 with gcc (GCC) 8.1.0
kernel signature: fe35db6f3e14949b410d83818298e8683836a0364d2cfc145c65626a8a7e9ac6
run #0: crashed: general protection fault in mount_fs
run #1: crashed: general protection fault in mount_fs
run #2: crashed: general protection fault in mount_fs
run #3: crashed: general protection fault in mount_fs
run #4: crashed: general protection fault in corrupted
run #5: crashed: general protection fault in mount_fs
run #6: crashed: general protection fault in mount_fs
run #7: crashed: general protection fault in mount_fs
run #8: crashed: general protection fault in mount_fs
run #9: crashed: general protection fault in mount_fs
revisions tested: 2, total time: 23m22.13527077s (build: 16m37.967041041s, test: 6m9.002646571s)
the crash still happens on HEAD
commit msg: Linux 4.19.164
crash: general protection fault in mount_fs
EXT4-fs (loop2): not enough memory for 1 flex group pointers
EXT4-fs (loop2): unable to initialize flex_bg meta info!
EXT4-fs (loop2): mount failed
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10258 Comm: syz-executor.2 Not tainted 4.19.164-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mount_fs+0xa9/0x2a2 fs/super.c:1266
Code: 4d 89 f0 48 3d 00 f0 ff ff 49 89 c5 0f 87 38 01 00 00 48 8d b8 c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 49 8b 9d c8 00 00 00 48 85 db 0f 84
RSP: 0018:ffff88808f58fcb0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a8fe5c00 RCX: 1ffff1101350892d
RDX: 0000000000000019 RSI: ffff88809a844948 RDI: 00000000000000c8
RBP: ffff88808f58fcf0 R08: ffff88809b7b4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89a97ce0
R13: 0000000000000000 R14: ffff88809b7b4000 R15: 0000000000000000
FS:  00007ff34fb2d700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016b9e60 CR3: 000000009cb9e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x376/0x2710 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: 0033:0x46090a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 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 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ff34fb2ca88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff34fb2cb20 RCX: 000000000046090a
RDX: 0000000020000080 RSI: 0000000020000100 RDI: 00007ff34fb2cae0
RBP: 00007ff34fb2cae0 R08: 00007ff34fb2cb20 R09: 0000000020000080
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000080
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000040
Modules linked in:
---[ end trace baf3fc59467e2652 ]---
RIP: 0010:mount_fs+0xa9/0x2a2 fs/super.c:1266
Code: 4d 89 f0 48 3d 00 f0 ff ff 49 89 c5 0f 87 38 01 00 00 48 8d b8 c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 49 8b 9d c8 00 00 00 48 85 db 0f 84
RSP: 0018:ffff88808f58fcb0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a8fe5c00 RCX: 1ffff1101350892d
RDX: 0000000000000019 RSI: ffff88809a844948 RDI: 00000000000000c8
RBP: ffff88808f58fcf0 R08: ffff88809b7b4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89a97ce0
R13: 0000000000000000 R14: ffff88809b7b4000 R15: 0000000000000000
FS:  00007ff34fb2d700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa606a7e000 CR3: 000000009cb9e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400