bisecting fixing commit since 0bf999f9c5e74c7ecf9dafb527146601e5c848b9
building syzkaller on c5ed587f4af5e639f7373d8ebf10ac049cb9c71b
testing commit 0bf999f9c5e74c7ecf9dafb527146601e5c848b9 with gcc (GCC) 8.1.0
kernel signature: 2b8016fba3b0b8ebda49ad1c35ec63526e96c792763213c331cc3dce000208e4
all runs: crashed: BUG: unable to handle kernel paging request in do_xdp_generic
testing current HEAD ac309e7744bee222df6de0122facaf2d9706fa70
testing commit ac309e7744bee222df6de0122facaf2d9706fa70 with gcc (GCC) 8.1.0
kernel signature: ad24fee86dccd8bb1f670145c0cd62f7e393d1945c3859c5f00f2c3a33c9806a
all runs: crashed: BUG: unable to handle kernel paging request in do_xdp_generic
revisions tested: 2, total time: 22m7.988618026s (build: 13m13.305276666s, test: 8m28.970928804s)
the crash still happens on HEAD
commit msg: Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
crash: BUG: unable to handle kernel paging request in do_xdp_generic
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
BUG: unable to handle page fault for address: ffff887f8c1797ff
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8518 Comm: syz-executor.2 Not tainted 5.6.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:is_multicast_ether_addr_64bits include/linux/etherdevice.h:135 [inline]
RIP: 0010:netif_receive_generic_xdp net/core/dev.c:4554 [inline]
RIP: 0010:do_xdp_generic.part.132+0x3dd/0x17f0 net/core/dev.c:4652
Code: 4d 89 74 24 b0 49 89 44 24 a8 48 89 85 18 ff ff ff 48 b8 00 00 00 00 00 fc ff df 4d 89 7c 24 b8 80 3c 02 00 0f 85 bd 0f 00 00 <49> 8b 06 49 8d 7e 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 00 ff
RSP: 0018:ffffc90002fd76e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff920005faeed RCX: ffffffff0000feff
RDX: 1ffff10ff182f2ff RSI: 0000000000000000 RDI: ffffffffffff0101
RBP: ffffc90002fd7810 R08: ffff888090e0f776 R09: ffffed101182d35d
R10: ffffed101182d35c R11: ffff88808c169ae3 R12: ffffc90002fd77e8
R13: ffff888090e0f6c0 R14: ffff887f8c1797ff R15: ffff88808c169800
FS:  00007fe2abc4f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff887f8c1797ff CR3: 00000000a855b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_xdp_generic+0xe/0x20 net/core/dev.c:4646
 tun_get_user+0x2116/0x37b0 drivers/net/tun.c:1935
 tun_chr_write_iter+0xaf/0x150 drivers/net/tun.c:2026
 call_write_iter include/linux/fs.h:1902 [inline]
 do_iter_readv_writev+0x526/0xa70 fs/read_write.c:693
 do_iter_write+0x12a/0x510 fs/read_write.c:998
 vfs_writev+0x16d/0x2d0 fs/read_write.c:1071
 do_writev+0x112/0x2e0 fs/read_write.c:1114
 __do_sys_writev fs/read_write.c:1187 [inline]
 __se_sys_writev fs/read_write.c:1184 [inline]
 __x64_sys_writev+0x70/0xb0 fs/read_write.c:1184
 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c581
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 b7 fb ff c3 48 83 ec 08 e8 fa 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 43 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fe2abc4eba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 000000000045c581
RDX: 0000000000000001 RSI: 00007fe2abc4ec00 RDI: 00000000000000f0
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000034 R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000b7c R14: 00000000004cd906 R15: 000000000076bf2c
Modules linked in:
CR2: ffff887f8c1797ff
---[ end trace 2d71cf70c1426af1 ]---
RIP: 0010:is_multicast_ether_addr_64bits include/linux/etherdevice.h:135 [inline]
RIP: 0010:netif_receive_generic_xdp net/core/dev.c:4554 [inline]
RIP: 0010:do_xdp_generic.part.132+0x3dd/0x17f0 net/core/dev.c:4652
Code: 4d 89 74 24 b0 49 89 44 24 a8 48 89 85 18 ff ff ff 48 b8 00 00 00 00 00 fc ff df 4d 89 7c 24 b8 80 3c 02 00 0f 85 bd 0f 00 00 <49> 8b 06 49 8d 7e 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 00 ff
RSP: 0018:ffffc90002fd76e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff920005faeed RCX: ffffffff0000feff
RDX: 1ffff10ff182f2ff RSI: 0000000000000000 RDI: ffffffffffff0101
RBP: ffffc90002fd7810 R08: ffff888090e0f776 R09: ffffed101182d35d
R10: ffffed101182d35c R11: ffff88808c169ae3 R12: ffffc90002fd77e8
R13: ffff888090e0f6c0 R14: ffff887f8c1797ff R15: ffff88808c169800
FS:  00007fe2abc4f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff887f8c1797ff CR3: 00000000a855b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400