bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072
building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a
testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217
kernel signature: b386ac6af1667d33304697817a62dbb452add314ddb47fae8f32a18425e2a429
run #0: crashed: kernel BUG in ext4_write_inline_data_end
run #1: crashed: kernel BUG in ext4_write_inline_data_end
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
reproducer seems to be flaky
testing current HEAD 030194a5b292bb7613407668d85af0b987bb9839
testing commit 030194a5b292bb7613407668d85af0b987bb9839 with gcc (GCC) 8.4.1 20210217
kernel signature: f47d602778bdc810a923b3f58e43df700214e64d8c333eadcc3920ab9651bafe
run #0: crashed: kernel BUG in ext4_write_inline_data_end
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
Reproducer flagged being flaky
revisions tested: 2, total time: 34m58.359478066s (build: 16m17.81058168s, test: 18m3.660346355s)
the crash still happens on HEAD
commit msg: Linux 4.19.180
crash: kernel BUG in ext4_write_inline_data_end
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:751!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 12596 Comm: syz-executor.1 Not tainted 4.19.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_write_inline_data_end+0x398/0x530 fs/ext4/inline.c:751
Code: f9 48 c1 e9 03 80 3c 11 00 0f 85 5e 01 00 00 48 8b 7b 28 89 c1 ba e9 02 00 00 48 c7 c6 00 d5 18 88 e8 dc e8 0d 00 31 c0 eb 8e <0f> 0b 49 8d 78 08 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 5c 01 00
RSP: 0018:ffff88807ce4f7f8 EFLAGS: 00010246
RAX: 0000008800080000 RBX: ffff88807fa59630 RCX: 1ffff1100ff4b292
RDX: dffffc0000000000 RSI: 0000008000080000 RDI: ffff88807fa594f0
RBP: ffff88807ce4f8a8 R08: 0000000000007051 R09: ffffffff8b5e3788
R10: ffff888098b98f00 R11: 0000000000000001 R12: ffffea000202f3c0
R13: 1ffff1100f9c9f04 R14: ffff88807ce4f840 R15: ffff88807ce4f880
FS:  00007f814c465700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd3828f000 CR3: 000000009cca8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_write_end+0x167/0xb10 fs/ext4/inode.c:1424
 ext4_da_write_end+0x622/0x9b0 fs/ext4/inode.c:3171
 generic_perform_write+0x2e3/0x480 mm/filemap.c:3181
 __generic_file_write_iter+0x205/0x590 mm/filemap.c:3295
 ext4_file_write_iter+0x281/0xe50 fs/ext4/file.c:272
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x443/0x890 fs/read_write.c:487
 vfs_write+0x150/0x4d0 fs/read_write.c:549
 ksys_write+0x103/0x260 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:608
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465d99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f814c465188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99
RDX: 0000000000000082 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc1fc42f5f R14: 00007f814c465300 R15: 0000000000022000
Modules linked in:
---[ end trace 3c1455d7ce0fa362 ]---
RIP: 0010:ext4_write_inline_data_end+0x398/0x530 fs/ext4/inline.c:751
Code: f9 48 c1 e9 03 80 3c 11 00 0f 85 5e 01 00 00 48 8b 7b 28 89 c1 ba e9 02 00 00 48 c7 c6 00 d5 18 88 e8 dc e8 0d 00 31 c0 eb 8e <0f> 0b 49 8d 78 08 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 5c 01 00
RSP: 0018:ffff88807ce4f7f8 EFLAGS: 00010246
RAX: 0000008800080000 RBX: ffff88807fa59630 RCX: 1ffff1100ff4b292
RDX: dffffc0000000000 RSI: 0000008000080000 RDI: ffff88807fa594f0
RBP: ffff88807ce4f8a8 R08: 0000000000007051 R09: ffffffff8b5e3788
R10: ffff888098b98f00 R11: 0000000000000001 R12: ffffea000202f3c0
R13: 1ffff1100f9c9f04 R14: ffff88807ce4f840 R15: ffff88807ce4f880
FS:  00007f814c465700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd38296000 CR3: 000000009cca8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400