bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on f30c14bfec4b49e528a756b28cc010925e2f286b
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.1.0
kernel signature: 640d1198fe371c995813565c16ebc2e6d0d27c24b5643774e30a436aa5337528
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: OK
run #9: OK
testing current HEAD 14b58326976de6ef3998eefec1dd7f8b38b97a75
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.1.0
kernel signature: 55224c71bc27ba19828ea1c4899d9df7386069da2ab652ad26f36e7177bc9ba6
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 __delete_from_page_cache
run #5: crashed: WARNING in __delete_from_page_cache
run #6: crashed: kernel BUG at fs/buffer.c:LINE!
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 41m15.375128931s (build: 18m37.078335025s, test: 21m27.011155698s)
the crash still happens on HEAD
commit msg: Linux 4.14.193
crash: kernel BUG at fs/buffer.c:LINE!
minix_free_inode: bit 1 already cleared
minix_free_inode: bit 1 already cleared
MINIX-fs: mounting unchecked file system, running fsck is recommended
minix_free_inode: bit 1 already cleared
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3122!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 32020 Comm: syz-executor.0 Not tainted 4.14.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88807c154400 task.stack: ffff88807b648000
RIP: 0010:submit_bh_wbc+0x507/0x720 fs/buffer.c:3122
RSP: 0000:ffff88807b64fb28 EFLAGS: 00010246
RAX: 0000000000000004 RBX: ffff888077ddbbd0 RCX: 0000000000000000
RDX: 1ffff1100efbb77a RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807b64fb70 R08: 0000000000000000 R09: 0000000000000000
R10: 1ffffffff0fe2d2b R11: 0000000000000000 R12: 0000000000000000
R13: ffff88808d07f240 R14: 0000000000000008 R15: 0000000000000000
FS:  00007fe686957700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000516660 CR3: 00000000a81fc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3169 [inline]
 __bread_slow fs/buffer.c:1238 [inline]
 __bread_gfp+0xbb/0x180 fs/buffer.c:1431
 sb_bread include/linux/buffer_head.h:309 [inline]
 minix_fill_super+0x84c/0x1830 fs/minix/inode.c:255
 mount_bdev+0x26f/0x330 fs/super.c:1134
 minix_mount+0x10/0x20 fs/minix/inode.c:656
 mount_fs+0x7f/0x269 fs/super.c:1237
 vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x352/0x2af0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xb1/0xd0 fs/namespace.c:3072
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45f5fa
RSP: 002b:00007fe686956a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000050a320 RCX: 000000000045f5fa
RDX: 00007fe686956ae0 RSI: 0000000020000080 RDI: 00007fe686956b00
RBP: 000000000078bf00 R08: 00007fe686956b40 R09: 00007fe686956ae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c31 R14: 00000000004ce8a9 R15: 00007fe6869576d4
Code: 7e 33 45 89 65 10 4c 89 ef e8 66 34 5d 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 9f fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 2a a3 ec ff eb c6 e8 83 a2 ec 
RIP: submit_bh_wbc+0x507/0x720 fs/buffer.c:3122 RSP: ffff88807b64fb28
---[ end trace 74071097828e6a94 ]---