bisecting fixing commit since ddef1e8e3f6eb26034833b7255e3fa584d54a230
building syzkaller on 5ea87a6638e52a94361b26b8576a1605585815fb
testing commit ddef1e8e3f6eb26034833b7255e3fa584d54a230 with gcc (GCC) 8.1.0
kernel signature: 5578d713f89a8a70f83945a42ce9fc342147166fe62103540982d6b084329057
all runs: crashed: general protection fault in do_blockdev_direct_IO
testing current HEAD c6db52a88798e5a0dfef80041ad4d33cc8cf04eb
testing commit c6db52a88798e5a0dfef80041ad4d33cc8cf04eb with gcc (GCC) 8.1.0
kernel signature: 1454d39632dbd1f1410299d761ae01800825ce972edb1e480a312777a7214872
all runs: crashed: general protection fault in do_blockdev_direct_IO
revisions tested: 2, total time: 23m22.291636028s (build: 16m43.831015678s, test: 5m59.75383371s)
the crash still happens on HEAD
commit msg: Linux 4.14.183
crash: general protection fault in do_blockdev_direct_IO
kasan: GPF could be caused by NULL-ptr deref or user memory access
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
bridge0: port 2(bridge_slave_1) entered blocking state
general protection fault: 0000 [#1] PREEMPT SMP KASAN
bridge0: port 2(bridge_slave_1) entered forwarding state
Modules linked in:
CPU: 1 PID: 7138 Comm: syz-executor.0 Not tainted 4.14.183-syzkaller #0
kasan: CONFIG_KASAN_INLINE enabled
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888093b784c0 task.stack: ffff888083198000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:get_page include/linux/mm.h:839 [inline]
RIP: 0010:submit_page_section fs/direct-io.c:890 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline]
RIP: 0010:do_blockdev_direct_IO+0x18f1/0x6be0 fs/direct-io.c:1336
RSP: 0018:ffff88808319f490 EFLAGS: 00010202
kasan: GPF could be caused by NULL-ptr deref or user memory access
RAX: 0000000000000004 RBX: ffffea000250461c RCX: 000000000000000c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffff88808319f7a0 R08: 0000000000000000 R09: ffff8880a5d47340
R10: ffffed1014ba8e78 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffea0002504600 R15: ffff88809427da40
FS:  00007f09c174a700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f20000 CR3: 0000000092a61000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __blockdev_direct_IO+0x72/0xd9 fs/direct-io.c:1422
 ext4_direct_IO_write fs/ext4/inode.c:3716 [inline]
 ext4_direct_IO+0x6ed/0x1b80 fs/ext4/inode.c:3852
 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:2950
 __generic_file_write_iter+0x270/0x580 mm/filemap.c:3129
 ext4_file_write_iter+0x27a/0xe40 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1778 [inline]
 do_iter_readv_writev+0x460/0x900 fs/read_write.c:675
 do_iter_write+0x12b/0x520 fs/read_write.c:954
 vfs_iter_write+0x5b/0xb0 fs/read_write.c:967
 iter_file_splice_write+0x540/0xc20 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 do_splice fs/splice.c:1147 [inline]
 SYSC_splice fs/splice.c:1402 [inline]
 SyS_splice+0x6e9/0x1580 fs/splice.c:1382
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x459f49
RSP: 002b:00007f09c1749c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459f49
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09c174a6d4
R13: 00000000004c9c8b R14: 00000000004e0af8 R15: 00000000ffffffff
Code: ff ff 48 8b bc 24 e0 00 00 00 48 c7 c6 60 80 94 86 e8 f4 ff e0 ff 0f 0b 48 8b 84 24 e0 00 00 00 48 8d 78 20 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 f3 44 00 00 48 8b 9c 24 e0 00 00 00 48 8b 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff88808319f490
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff88808319f490
RIP: get_page include/linux/mm.h:839 [inline] RSP: ffff88808319f490
RIP: submit_page_section fs/direct-io.c:890 [inline] RSP: ffff88808319f490
RIP: do_direct_IO fs/direct-io.c:1097 [inline] RSP: ffff88808319f490
RIP: do_blockdev_direct_IO+0x18f1/0x6be0 fs/direct-io.c:1336 RSP: ffff88808319f490
general protection fault: 0000 [#2] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7142 Comm: syz-executor.3 Tainted: G      D         4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
---[ end trace 0f27d6b0603eaff0 ]---
task: ffff8880925bc5c0 task.stack: ffff888092b70000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:get_page include/linux/mm.h:839 [inline]
RIP: 0010:submit_page_section fs/direct-io.c:890 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline]
RIP: 0010:do_blockdev_direct_IO+0x18f1/0x6be0 fs/direct-io.c:1336
RSP: 0018:ffff888092b77490 EFLAGS: 00010202