bisecting fixing commit since 7d120bf21c05cbe30a679f0feeca884eeaceb069
building syzkaller on 64ca0a371100fc7dfdb20de9263763e46c88a436
testing commit 7d120bf21c05cbe30a679f0feeca884eeaceb069 with gcc (GCC) 8.1.0
kernel signature: 97de465f623b96a6fff1d73144acbc57cfbb71b0
run #0: crashed: kernel BUG at fs/buffer.c:LINE!
run #1: crashed: kernel BUG at fs/buffer.c:LINE!
run #2: crashed: kernel BUG at fs/buffer.c:LINE!
run #3: crashed: kernel BUG at fs/buffer.c:LINE!
run #4: crashed: WARNING in unaccount_page_cache_page
run #5: crashed: kernel BUG at fs/buffer.c:LINE!
run #6: crashed: kernel BUG at fs/buffer.c:LINE!
run #7: crashed: kernel BUG at fs/buffer.c:LINE!
run #8: crashed: kernel BUG at fs/buffer.c:LINE!
run #9: crashed: kernel BUG at fs/buffer.c:LINE!
testing current HEAD dc4ba5be1babd3b3ec905751a30df89a5899a7a9
testing commit dc4ba5be1babd3b3ec905751a30df89a5899a7a9 with gcc (GCC) 8.1.0
kernel signature: cbf9b994f28511e0e0369d4af4e76c7519e5d1a9
run #0: crashed: kernel BUG at fs/buffer.c:LINE!
run #1: crashed: kernel BUG at fs/buffer.c:LINE!
run #2: crashed: kernel BUG at fs/buffer.c:LINE!
run #3: crashed: kernel BUG at fs/buffer.c:LINE!
run #4: crashed: kernel BUG at fs/buffer.c:LINE!
run #5: crashed: kernel BUG at fs/buffer.c:LINE!
run #6: crashed: kernel BUG at fs/buffer.c:LINE!
run #7: crashed: kernel BUG at fs/buffer.c:LINE!
run #8: crashed: WARNING in corrupted
run #9: crashed: kernel BUG at fs/buffer.c:LINE!
revisions tested: 2, total time: 28m17.448139412s (build: 18m37.768353619s, test: 8m40.905486475s)
the crash still happens on HEAD
commit msg: Linux 4.19.97
crash: kernel BUG at fs/buffer.c:LINE!
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3054!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 15722 Comm: syz-executor.0 Not tainted 4.19.97-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:submit_bh_wbc+0x4ee/0x700 fs/buffer.c:3054
Code: 33 45 89 65 10 4c 89 ef e8 4f d4 6c 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 b8 fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 93 dd ea ff eb c6 e8 ec dc ea ff
RSP: 0018:ffff888098f4fa08 EFLAGS: 00010246
RAX: 0000000000000004 RBX: ffff8880847a4150 RCX: 0000000000000000
RDX: 1ffff110108f482a RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888098f4fa50 R08: 0000000000000000 R09: ffffed10108f4836
R10: ffffed10108f4836 R11: ffff8880847a41b3 R12: 0000000000000000
R13: ffff888096d85540 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f2fe1eec700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 0000000094399000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3101 [inline]
 __bread_slow fs/buffer.c:1176 [inline]
 __bread_gfp+0xc9/0x220 fs/buffer.c:1358
 sb_bread include/linux/buffer_head.h:307 [inline]
 fat_fill_super+0x30a/0x3d70 fs/fat/inode.c:1641
 vfat_fill_super+0x15/0x20 fs/fat/namei_vfat.c:1048
 mount_bdev+0x278/0x330 fs/super.c:1158
 vfat_mount+0x10/0x20 fs/fat/namei_vfat.c:1055
 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: 0033:0x45d36a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c 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 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f2fe1eeba68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 000000000045d36a
RDX: 00007f2fe1eebae0 RSI: 00000000200002c0 RDI: 00007f2fe1eebb00
RBP: 000000000075bf20 R08: 00007f2fe1eebb40 R09: 00007f2fe1eebae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2fe1eec6d4
R13: 00000000004cae75 R14: 00000000004e4378 R15: 00000000ffffffff
Modules linked in:
---[ end trace 0bb7636a41a93125 ]---
RIP: 0010:submit_bh_wbc+0x4ee/0x700 fs/buffer.c:3054
Code: 33 45 89 65 10 4c 89 ef e8 4f d4 6c 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 b8 fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 93 dd ea ff eb c6 e8 ec dc ea ff
RSP: 0018:ffff888098f4fa08 EFLAGS: 00010246
RAX: 0000000000000004 RBX: ffff8880847a4150 RCX: 0000000000000000
RDX: 1ffff110108f482a RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888098f4fa50 R08: 0000000000000000 R09: ffffed10108f4836
R10: ffffed10108f4836 R11: ffff8880847a41b3 R12: 0000000000000000
R13: ffff888096d85540 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f2fe1eec700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 0000000094399000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400