bisecting fixing commit since 399849e4654ea496a6217ba4e5ee3d304c995ab4
building syzkaller on f30c14bfec4b49e528a756b28cc010925e2f286b
testing commit 399849e4654ea496a6217ba4e5ee3d304c995ab4 with gcc (GCC) 8.1.0
kernel signature: 15aa69dfa5d0b6ea6f455d2931ed1904d4505d56f8429762f4dff95425ec7933
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: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing current HEAD 13af6c74b14a883366e7702c40c52ff548096e7f
testing commit 13af6c74b14a883366e7702c40c52ff548096e7f with gcc (GCC) 8.1.0
kernel signature: 361c39449b3cf909b903b9a55025e95486866472b5e9c21cfe19728a7a5a8460
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: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 39m57.555073672s (build: 19m24.968080405s, test: 19m34.166317576s)
the crash still happens on HEAD
commit msg: Linux 4.19.136
crash: kernel BUG at fs/buffer.c:LINE!
MINIX-fs: mounting unchecked file system, running fsck is recommended
MINIX-fs: mounting unchecked file system, running fsck is recommended
MINIX-fs: mounting unchecked file system, running fsck is recommended
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3065!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
minix_free_inode: bit 1 already cleared
CPU: 0 PID: 29089 Comm: syz-executor.0 Not tainted 4.19.136-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:submit_bh_wbc+0x4e5/0x6f0 fs/buffer.c:3065
Code: 33 45 89 65 10 4c 89 ef e8 d8 25 75 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 c1 fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 5c 5e ea ff eb c6 e8 b5 5d ea ff
RSP: 0018:ffff888071147b18 EFLAGS: 00010246
RAX: 0000000000000004 RBX: ffff88806ff4bd20 RCX: 0000000000000000
RDX: 1ffff1100dfe97a4 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888071147b60 R08: 0000000000000000 R09: ffffed100dfe97b0
R10: ffffed100dfe97b0 R11: ffff88806ff4bd83 R12: 0000000000000000
R13: ffff888096b3e540 R14: 0000000000000004 R15: 0000000000000000
FS:  00007f6dbffca700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8316842020 CR3: 00000000922ba000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3112 [inline]
 __bread_slow fs/buffer.c:1176 [inline]
 __bread_gfp+0xc9/0x190 fs/buffer.c:1369
 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:1158
 minix_mount+0x10/0x20 fs/minix/inode.c:656
 mount_fs+0x7f/0x2a2 fs/super.c:1261
 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: 0033:0x45f5fa
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 2d 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 0a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f6dbffc9a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000050a320 RCX: 000000000045f5fa
RDX: 00007f6dbffc9ae0 RSI: 0000000020000080 RDI: 00007f6dbffc9b00
RBP: 000000000078bf00 R08: 00007f6dbffc9b40 R09: 00007f6dbffc9ae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c31 R14: 00000000004ce8a9 R15: 00007f6dbffca6d4
Modules linked in:
minix_free_inode: bit 1 already cleared
---[ end trace a15af159a8f40026 ]---
minix_free_inode: bit 1 already cleared
RIP: 0010:submit_bh_wbc+0x4e5/0x6f0 fs/buffer.c:3065
MINIX-fs: mounting unchecked file system, running fsck is recommended
Code: 33 45 89 65 10 4c 89 ef e8 d8 25 75 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 c1 fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 5c 5e ea ff eb c6 e8 b5 5d ea ff
RSP: 0018:ffff888071147b18 EFLAGS: 00010246
RAX: 0000000000000004 RBX: ffff88806ff4bd20 RCX: 0000000000000000
RDX: 1ffff1100dfe97a4 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888071147b60 R08: 0000000000000000 R09: ffffed100dfe97b0
R10: ffffed100dfe97b0 R11: ffff88806ff4bd83 R12: 0000000000000000
R13: ffff888096b3e540 R14: 0000000000000004 R15: 0000000000000000
FS:  00007f6dbffca700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6dbff87db8 CR3: 00000000922ba000 CR4: 00000000001406e0
MINIX-fs: mounting unchecked file system, running fsck is recommended
MINIX-fs: mounting unchecked file system, running fsck is recommended
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
minix_free_inode: bit 1 already cleared
minix_free_inode: bit 1 already cleared
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400