bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784
building syzkaller on d01bb02a96019cda0fa8c46e5c6d5eb66a273f17
testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.4.1 20210217
kernel signature: 7c4bd1e2b6cbcff32919415e9282fc68b22b044b659c6be1a7dc8ce032f45e34
all runs: crashed: general protection fault in do_blockdev_direct_IO
testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0
testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217
kernel signature: 7a2494bd3418aefcb1e9e54e4810bfbcfe076e4870df93105dd39a02c3a21adf
all runs: crashed: general protection fault in do_blockdev_direct_IO
revisions tested: 2, total time: 22m2.356738406s (build: 15m5.654268392s, test: 5m59.250278276s)
the crash still happens on HEAD
commit msg: Linux 4.19.176
crash: general protection fault in do_blockdev_direct_IO
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6560 Comm: syz-executor.5 Not tainted 4.19.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:207 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:get_page include/linux/mm.h:931 [inline]
RIP: 0010:submit_page_section fs/direct-io.c:889 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1096 [inline]
RIP: 0010:do_blockdev_direct_IO+0xeb7/0x6f40 fs/direct-io.c:1332
Code: 00 00 48 c7 84 24 90 02 00 00 00 00 00 00 45 85 e4 0f 85 38 0c 00 00 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 89 51 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 08
RSP: 0018:ffff8881d0def450 EFLAGS: 00010202
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffffffff81a518f5
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
RBP: ffff8881d0def790 R08: fffff94000e86e07 R09: fffff94000e86e06
R10: fffff94000e86e06 R11: ffffea0007437037 R12: 0000000000000000
R13: ffffea0007437000 R14: ffffea0007437034 R15: ffff8881e371ba40
FS:  00007ffb8d778700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d720000 CR3: 00000001e2da2005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __blockdev_direct_IO+0x72/0xe0 fs/direct-io.c:1418
 ext4_direct_IO_write fs/ext4/inode.c:3778 [inline]
 ext4_direct_IO+0x87f/0x17d0 fs/ext4/inode.c:3916
 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:3073
 __generic_file_write_iter+0x279/0x590 mm/filemap.c:3252
 ext4_file_write_iter+0x282/0xe60 fs/ext4/file.c:272
 call_write_iter include/linux/fs.h:1821 [inline]
 do_iter_readv_writev+0x4ae/0x960 fs/read_write.c:681
 do_iter_write fs/read_write.c:960 [inline]
 do_iter_write+0x12a/0x510 fs/read_write.c:941
 vfs_iter_write+0x5b/0xb0 fs/read_write.c:973
 iter_file_splice_write+0x55d/0xc40 fs/splice.c:750
 do_splice_from fs/splice.c:852 [inline]
 do_splice+0xa25/0x12b0 fs/splice.c:1154
 __do_sys_splice fs/splice.c:1428 [inline]
 __se_sys_splice fs/splice.c:1408 [inline]
 __x64_sys_splice+0x248/0x300 fs/splice.c:1408
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x461949
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:00007ffb8d7781a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000461949
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000006 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004f8f90 R14: 00000000004b50c4 R15: 00007ffb8d7786bc
Modules linked in:
---[ end trace 4ec40630139080be ]---
RIP: 0010:__read_once_size include/linux/compiler.h:207 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:get_page include/linux/mm.h:931 [inline]
RIP: 0010:submit_page_section fs/direct-io.c:889 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1096 [inline]
RIP: 0010:do_blockdev_direct_IO+0xeb7/0x6f40 fs/direct-io.c:1332
Code: 00 00 48 c7 84 24 90 02 00 00 00 00 00 00 45 85 e4 0f 85 38 0c 00 00 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 89 51 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 08
RSP: 0018:ffff8881d0def450 EFLAGS: 00010202
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffffffff81a518f5
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
RBP: ffff8881d0def790 R08: fffff94000e86e07 R09: fffff94000e86e06
R10: fffff94000e86e06 R11: ffffea0007437037 R12: 0000000000000000
R13: ffffea0007437000 R14: ffffea0007437034 R15: ffff8881e371ba40
FS:  00007ffb8d778700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d720000 CR3: 00000001e2da2005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400