bisecting fixing commit since 7d120bf21c05cbe30a679f0feeca884eeaceb069
building syzkaller on 36650b4b2c942bc382314dce384d311fbadd1208
testing commit 7d120bf21c05cbe30a679f0feeca884eeaceb069 with gcc (GCC) 8.1.0
kernel signature: 1d8706e08b1aff5635c3fdea30afea69b75d2648a565f69f1f1037ca5be72825
all runs: crashed: general protection fault in tcp_splice_read
testing current HEAD c4ff839de17f38b0ae0f8983b5c5186f8a389238
testing commit c4ff839de17f38b0ae0f8983b5c5186f8a389238 with gcc (GCC) 8.1.0
kernel signature: 736c4d19a278653accdfcbad7748b12e47eb16b6da106f48d05b97a5b5aa77b4
all runs: crashed: general protection fault in tcp_splice_read
revisions tested: 2, total time: 41m15.681429595s (build: 24m44.714059903s, test: 15m27.332602517s)
the crash still happens on HEAD
commit msg: Linux 4.19.171
crash: general protection fault in tcp_splice_read
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
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: 0 PID: 16666 Comm: syz-executor009 Not tainted 4.19.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tcp_splice_read+0x140/0x8f0 net/ipv4/tcp.c:809
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 a2 07 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 64 24 18 49 8d 7c 24 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 34 06 00 00 31 c0 41 f6 44 24
RSP: 0018:ffff8881df4ffba8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff1103be9ff79 RCX: 1ffff1103dbff15f
RDX: 000000000000000f RSI: ffff8881edff8ad8 RDI: 0000000000000078
RBP: ffff8881df4ffcf0 R08: ffff8881edff8af8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881df4ffcc8 R14: ffff8881df4ffe58 R15: ffff8881d9714d80
FS:  00007fe232986700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c8b383000 CR3: 00000001eaba1005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 smc_splice_read+0x1f6/0x330 net/smc/af_smc.c:1855
 sock_splice_read+0x92/0x120 net/socket.c:859
 do_splice_to+0xe3/0x120 fs/splice.c:881
 do_splice+0xe40/0x12d0 fs/splice.c:1186
 __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: 0033:0x448529
Code: e8 0c 0f 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 7b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe232985d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000006ddc78 RCX: 0000000000448529
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00000000006ddc70 R08: 000000000d86dac9 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc7c
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000064616561
Modules linked in:
---[ end trace 3adf17a22895b39d ]---
RIP: 0010:tcp_splice_read+0x140/0x8f0 net/ipv4/tcp.c:809
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 a2 07 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 64 24 18 49 8d 7c 24 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 34 06 00 00 31 c0 41 f6 44 24
RSP: 0018:ffff8881df4ffba8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff1103be9ff79 RCX: 1ffff1103dbff15f
RDX: 000000000000000f RSI: ffff8881edff8ad8 RDI: 0000000000000078
RBP: ffff8881df4ffcf0 R08: ffff8881edff8af8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881df4ffcc8 R14: ffff8881df4ffe58 R15: ffff8881d9714d80
FS:  00007fe232986700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a895212288 CR3: 00000001eaba1005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400