bisecting fixing commit since 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7
building syzkaller on c88c7b75a4e022b758f4b0f1bf3db8ebb2fb25e6
testing commit 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7 with gcc (GCC) 8.1.0
kernel signature: 78f82175e867b6cf82e05091796af911cdf5fa1fcd29bb60f1edc7c62c41b65c
all runs: crashed: general protection fault in j1939_netdev_start
testing current HEAD 04300d66f0a06d572d9f2ad6768c38cabde22179
testing commit 04300d66f0a06d572d9f2ad6768c38cabde22179 with gcc (GCC) 8.1.0
kernel signature: aa4c7ac143f04dc1513bc33d0832dd243f9aa046a7fee316394d2173a7c0fca5
all runs: crashed: BUG: unable to handle kernel paging request in j1939_netdev_start
revisions tested: 2, total time: 20m26.557752263s (build: 11m24.198450767s, test: 8m13.840658655s)
the crash still happens on HEAD
commit msg: Merge tag 'riscv-for-linus-5.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux into master
crash: BUG: unable to handle kernel paging request in j1939_netdev_start
BUG: unable to handle page fault for address: 0000000000006028
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1093bf067 P4D 1093bf067 PUD 10a1eb067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP
CPU: 0 PID: 9475 Comm: syz-executor.1 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:j1939_priv_set net/can/j1939/main.c:145 [inline]
RIP: 0010:j1939_netdev_start+0x16a/0x260 net/can/j1939/main.c:280
Code: e8 1b d1 3e 00 49 8b 85 68 05 00 00 65 ff 08 4c 89 e7 e8 99 25 72 fe e9 dc fe ff ff 49 8b 85 a0 05 00 00 48 c7 c7 00 0b 54 84 <4c> 89 a0 28 60 00 00 e8 ea d0 3e 00 49 8b 5c 24 50 b8 01 00 00 00
RSP: 0018:ffffc90004d6fde8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff84540b18 RDI: ffffffff84540b00
RBP: ffffc90004d6fe08 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 8d097b8fd02c6021 R12: ffff8881092c8000
R13: ffff888109128000 R14: ffff88811a26aa00 R15: 0000000000000000
FS:  00007f3fb6ecb700(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000006028 CR3: 00000001090d3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 j1939_sk_bind+0x1b7/0x200 net/can/j1939/socket.c:469
 __sys_bind+0xe0/0x100 net/socket.c:1657
 __do_sys_bind net/socket.c:1668 [inline]
 __se_sys_bind net/socket.c:1666 [inline]
 __x64_sys_bind+0x15/0x20 net/socket.c:1666
 do_syscall_64+0x64/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c4f9
Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3fb6ecac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007f3fb6ecb6d4 RCX: 000000000045c4f9
RDX: 0000000000000018 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000030 R14: 00000000004c299e R15: 000000000076bf2c
Modules linked in:
CR2: 0000000000006028
---[ end trace 4a26efbee0f6725c ]---
RIP: 0010:j1939_priv_set net/can/j1939/main.c:145 [inline]
RIP: 0010:j1939_netdev_start+0x16a/0x260 net/can/j1939/main.c:280
Code: e8 1b d1 3e 00 49 8b 85 68 05 00 00 65 ff 08 4c 89 e7 e8 99 25 72 fe e9 dc fe ff ff 49 8b 85 a0 05 00 00 48 c7 c7 00 0b 54 84 <4c> 89 a0 28 60 00 00 e8 ea d0 3e 00 49 8b 5c 24 50 b8 01 00 00 00
RSP: 0018:ffffc90004d6fde8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff84540b18 RDI: ffffffff84540b00
RBP: ffffc90004d6fe08 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 8d097b8fd02c6021 R12: ffff8881092c8000
R13: ffff888109128000 R14: ffff88811a26aa00 R15: 0000000000000000
FS:  00007f3fb6ecb700(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000006028 CR3: 00000001090d3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400