bisecting fixing commit since 1bab61d3e8cd96f2badf515dcb06e4e1029bc017
building syzkaller on 4afdfa205b55633e7eb9db03a9d099d7aa324801
testing commit 1bab61d3e8cd96f2badf515dcb06e4e1029bc017 with gcc (GCC) 8.1.0
kernel signature: bd3422b019ab0d0170b49c08a5da381b024a1c5e1b77dd0b25a05e272b4d6763
all runs: crashed: kernel BUG at mm/memory.c:LINE!
testing current HEAD 17a87580a8856170d59aab302226811a4ae69149
testing commit 17a87580a8856170d59aab302226811a4ae69149 with gcc (GCC) 8.1.0
kernel signature: c5724c71e9e72f4055e774b05dd9e25d840a32290dbeb359422f7cddf910bb21
all runs: crashed: kernel BUG at mm/memory.c:LINE!
revisions tested: 2, total time: 25m36.161518032s (build: 18m37.98720579s, test: 6m4.818111185s)
the crash still happens on HEAD
commit msg: Linux 4.19.133
crash: kernel BUG at mm/memory.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
kernel BUG at mm/memory.c:3947!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
CPU: 0 PID: 7830 Comm: syz-executor.0 Not tainted 4.19.133-syzkaller #0
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
RIP: 0010:wp_huge_pmd mm/memory.c:3947 [inline]
RIP: 0010:__handle_mm_fault+0x2177/0x41a0 mm/memory.c:4155
Code: 49 8d b6 a0 00 00 00 48 89 da 44 89 9d 10 ff ff ff e8 2d 71 fe ff 44 8b 9d 10 ff ff ff e9 28 ec ff ff 48 89 df e8 70 a7 fd ff <0f> 0b 49 8d 84 24 60 ff ff ff 48 89 c7 e8 77 ed 0b 00 41 89 c3 e9
RSP: 0018:ffff88808dc87cc8 EFLAGS: 00010296
RAX: 0000000000000137 RBX: ffff88808d3fe210 RCX: 0000000000000000
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RDX: 0000000000000000 RSI: ffffffff87677ce0 RDI: ffffffff8a196a60
RBP: ffff88808dc87de8 R08: ffffed1015d45081 R09: ffffed1015d45080
R10: ffffed1015d45080 R11: ffff8880aea28407 R12: ffff88808dc87dc0
R13: 1ffff11011b90fa0 R14: ffffffff873111a0 R15: ffff88808c708040
FS:  0000000001987940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
CR2: 000055d4ade5f458 CR3: 000000008c49a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 handle_mm_fault+0x3dd/0x8ab mm/memory.c:4202
 __do_page_fault+0x50e/0xb30 arch/x86/mm/fault.c:1412
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 do_page_fault+0x64/0x3a7 arch/x86/mm/fault.c:1487
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205
RIP: 0033:0x443d51
Code: 8d 15 b3 1b 0d 00 8b 0c 8a 8b 04 82 29 c8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 fa 20 48 89 f8 73 77 f6 c2 01 74 0b 0f b6 0e <88> 0f 48 ff c6 48 ff c7 f6 c2 02 74 12 0f b7 0e 66 89 0f 48 83 c6
RSP: 002b:00007ffe8d620f88 EFLAGS: 00010202
RAX: 00000000200001c0 RBX: 0000000000000000 RCX: 0000000000000063
RDX: 0000000000000013 RSI: 0000000000790398 RDI: 00000000200001c0
RBP: 0000000000790378 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe8d621070 R11: 0000000000000246 R12: 0000000000790380
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
R13: 000000000000c412 R14: fffffffffffffffe R15: 000000000078c04c
Modules linked in:
---[ end trace dc4277b69c8c80f5 ]---
batman_adv: batadv0: Interface activated: batadv_slave_1
RIP: 0010:wp_huge_pmd mm/memory.c:3947 [inline]
RIP: 0010:__handle_mm_fault+0x2177/0x41a0 mm/memory.c:4155
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
Code: 49 8d b6 a0 00 00 00 48 89 da 44 89 9d 10 ff ff ff e8 2d 71 fe ff 44 8b 9d 10 ff ff ff e9 28 ec ff ff 48 89 df e8 70 a7 fd ff <0f> 0b 49 8d 84 24 60 ff ff ff 48 89 c7 e8 77 ed 0b 00 41 89 c3 e9
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RSP: 0018:ffff88808dc87cc8 EFLAGS: 00010296
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
RAX: 0000000000000137 RBX: ffff88808d3fe210 RCX: 0000000000000000
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RDX: 0000000000000000 RSI: ffffffff87677ce0 RDI: ffffffff8a196a60
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
RBP: ffff88808dc87de8 R08: ffffed1015d45081 R09: ffffed1015d45080
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
R10: ffffed1015d45080 R11: ffff8880aea28407 R12: ffff88808dc87dc0
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
R13: 1ffff11011b90fa0 R14: ffffffff873111a0 R15: ffff88808c708040
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
FS:  0000000001987940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
batman_adv: batadv0: Interface activated: batadv_slave_1
CR2: 00007fa2cde33028 CR3: 000000008c49a000 CR4: 00000000001406f0
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready