bisecting fixing commit since 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc
building syzkaller on 676bd07e7e80f8a270af7f0276443c68f4a99e25
testing commit 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc with gcc (GCC) 8.1.0
kernel signature: a898b45213bd1bc5ef54edb22c87163b4bad16c555aed69c4571eaa313d61da7
all runs: crashed: kernel BUG at fs/hfs/inode.c:LINE!
testing current HEAD fb33c6510d5595144d585aa194d377cf74d31911
testing commit fb33c6510d5595144d585aa194d377cf74d31911 with gcc (GCC) 8.1.0
kernel signature: c0abce1604a6c485e1e59f968714950cff35214a21062d8d42ffed9d134ada1c
all runs: crashed: kernel BUG at fs/hfs/inode.c:LINE!
revisions tested: 2, total time: 16m54.001537646s (build: 10m10.577035274s, test: 5m58.424891287s)
the crash still happens on HEAD
commit msg: Linux 5.6-rc6
crash: kernel BUG at fs/hfs/inode.c:LINE!
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
------------[ cut here ]------------
kernel BUG at fs/hfs/inode.c:441!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 49 Comm: kworker/u4:2 Not tainted 5.6.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-7:4)
RIP: 0010:hfs_write_inode+0x46d/0xa50 fs/hfs/inode.c:441
Code: c4 38 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 83 f8 03 0f 84 9f 00 00 00 48 83 f8 04 74 0c 48 83 f8 02 0f 84 4a fc ff ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1
RSP: 0018:ffff8881d9a2f788 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff1103b345ef4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8881d9a2fa08 RDI: ffff8881c4ebecc0
RBP: ffff8881d9a2f8e8 R08: 0000000000000000 R09: ffffed103b606fe4
R10: ffffed103b606fe3 R11: ffff8881db037f1b R12: ffff8881c4ebec80
R13: dffffc0000000000 R14: ffff8881d9a2f8c0 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557fdcf470f0 CR3: 00000001c65e5000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 write_inode fs/fs-writeback.c:1312 [inline]
 __writeback_single_inode+0x8da/0xda0 fs/fs-writeback.c:1511
 writeback_sb_inodes+0x47d/0xf10 fs/fs-writeback.c:1716
 wb_writeback+0x2a0/0x960 fs/fs-writeback.c:1892
 wb_do_writeback fs/fs-writeback.c:2037 [inline]
 wb_workfn+0x331/0xf00 fs/fs-writeback.c:2078
 process_one_work+0x852/0x1620 kernel/workqueue.c:2266
 worker_thread+0x81/0xb80 kernel/workqueue.c:2412
 kthread+0x334/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 021414cc2b4ac522 ]---
RIP: 0010:hfs_write_inode+0x46d/0xa50 fs/hfs/inode.c:441
Code: c4 38 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 83 f8 03 0f 84 9f 00 00 00 48 83 f8 04 74 0c 48 83 f8 02 0f 84 4a fc ff ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1
RSP: 0018:ffff8881d9a2f788 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff1103b345ef4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8881d9a2fa08 RDI: ffff8881c4ebecc0
RBP: ffff8881d9a2f8e8 R08: 0000000000000000 R09: ffffed103b606fe4
R10: ffffed103b606fe3 R11: ffff8881db037f1b R12: ffff8881c4ebec80
R13: dffffc0000000000 R14: ffff8881d9a2f8c0 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557fdcf470f0 CR3: 00000001c65e5000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400