bisecting fixing commit since 675cc038067f0e530471c56a7442935f84669d95 building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3 testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.4.1 20210217 kernel signature: 3341f688d32d404c4b66cd1177162ff6e0de52682f453ec6024670e1bca99029 all runs: crashed: BUG: unable to handle kernel paging request in do_csum testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217 kernel signature: 18b173c91aa50d9408daa346d98d41839aa016d1b72264503dc0d9256d39392b all runs: crashed: BUG: unable to handle kernel paging request in do_csum revisions tested: 2, total time: 23m33.4002379s (build: 16m25.154637737s, test: 6m46.338775952s) the crash still happens on HEAD commit msg: Linux 4.19.183 crash: BUG: unable to handle kernel paging request in do_csum IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready BUG: unable to handle kernel paging request at ffff8880bfffd000 PGD c801067 P4D c801067 PUD 23ffff067 PMD 23fffe067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9823 Comm: syz-executor.2 Not tainted 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_csum+0xea/0x2f0 arch/x86/lib/csum-partial_64.c:72 Code: 48 01 c3 44 89 f1 41 c1 ee 04 d1 e9 45 85 f6 0f 84 d4 01 00 00 41 8d 46 ff 31 d2 48 83 c0 01 48 c1 e0 06 4c 01 e0 49 03 1c 24 <49> 13 5c 24 08 49 13 5c 24 10 49 13 5c 24 18 49 13 5c 24 20 49 13 RSP: 0018:ffff88809b807348 EFLAGS: 00010202 RAX: ffff88819bdbbbb8 RBX: 7a9ec23ca2476bea RCX: 000000001ffffffd RDX: 0000000000000000 RSI: ffffffffffffffec RDI: ffff88809bdbbbf8 RBP: ffff88809b807370 R08: ffff8880b14ab710 R09: 0000000000000100 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880bfffcff8 R13: 0000000000000000 R14: 0000000003ffffff R15: ffff88809bdbbbf8 FS: 00007f518a6c9700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 00000000a56b7000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csum_partial+0xc/0x20 arch/x86/lib/csum-partial_64.c:136 lco_csum include/linux/skbuff.h:4238 [inline] gre_checksum include/net/gre.h:105 [inline] gre_build_header include/net/gre.h:140 [inline] __gre_xmit+0x786/0x8e0 net/ipv4/ip_gre.c:443 ipgre_xmit+0x396/0x870 net/ipv4/ip_gre.c:703 __netdev_start_xmit include/linux/netdevice.h:4345 [inline] netdev_start_xmit include/linux/netdevice.h:4359 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x160/0x6e0 net/core/dev.c:3272 __dev_queue_xmit+0x1ca6/0x2900 net/core/dev.c:3838 dev_queue_xmit+0xb/0x10 net/core/dev.c:3871 packet_snd net/packet/af_packet.c:2988 [inline] packet_sendmsg+0x3449/0x6380 net/packet/af_packet.c:3013 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 kernel_sendmsg+0x26/0x30 net/socket.c:640 sock_no_sendpage+0xfd/0x140 net/core/sock.c:2668 kernel_sendpage+0x60/0xd0 net/socket.c:3378 sock_sendpage+0x6d/0xd0 net/socket.c:847 pipe_to_sendpage+0x212/0x430 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x2cb/0x720 fs/splice.c:627 splice_from_pipe+0xbb/0x120 fs/splice.c:662 generic_splice_sendpage+0x10/0x20 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0x71e/0x17e0 fs/splice.c:1408 __x64_sys_splice+0xdc/0x1a0 fs/splice.c:1408 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 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:00007f518a6c9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000004b069f R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fffc255774f R14: 00007f518a6c9300 R15: 0000000000022000 Modules linked in: CR2: ffff8880bfffd000 ---[ end trace 86f51fc91bc85b09 ]--- RIP: 0010:do_csum+0xea/0x2f0 arch/x86/lib/csum-partial_64.c:72 Code: 48 01 c3 44 89 f1 41 c1 ee 04 d1 e9 45 85 f6 0f 84 d4 01 00 00 41 8d 46 ff 31 d2 48 83 c0 01 48 c1 e0 06 4c 01 e0 49 03 1c 24 <49> 13 5c 24 08 49 13 5c 24 10 49 13 5c 24 18 49 13 5c 24 20 49 13 RSP: 0018:ffff88809b807348 EFLAGS: 00010202 RAX: ffff88819bdbbbb8 RBX: 7a9ec23ca2476bea RCX: 000000001ffffffd RDX: 0000000000000000 RSI: ffffffffffffffec RDI: ffff88809bdbbbf8 RBP: ffff88809b807370 R08: ffff8880b14ab710 R09: 0000000000000100 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880bfffcff8 R13: 0000000000000000 R14: 0000000003ffffff R15: ffff88809bdbbbf8 FS: 00007f518a6c9700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 BUG: unable to handle kernel paging request at ffff8880bfffd000 CR2: ffff8880bfffd000 CR3: 00000000a56b7000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400