bisecting fixing commit since 961f830af0658ef5ef8a7708786d634a6115f16b
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 961f830af0658ef5ef8a7708786d634a6115f16b with gcc (GCC) 8.1.0
kernel signature: baaa16528c573eb9772c6e194290073677b97032cd1aeb2a030be3d9e17f27eb
all runs: crashed: general protection fault in xdp_del_sk_umem
testing current HEAD a87f96283793d58b042618c689630db264715274
testing commit a87f96283793d58b042618c689630db264715274 with gcc (GCC) 8.1.0
kernel signature: c87e3de2cce71d8119d244a235eae254bb94849e1cb06b2159eb89728f21fcc1
all runs: crashed: general protection fault in xdp_del_sk_umem
revisions tested: 2, total time: 23m55.091098858s (build: 17m2.603235087s, test: 6m19.364129741s)
the crash still happens on HEAD
commit msg: Linux 4.19.145
crash: general protection fault in xdp_del_sk_umem
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
kasan: CONFIG_KASAN_INLINE enabled
general protection fault: 0000 [#1] PREEMPT SMP KASAN
kasan: GPF could be caused by NULL-ptr deref or user memory access
CPU: 0 PID: 7964 Comm: syz-executor.4 Not tainted 4.19.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51
Code: 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 49 8d 7d
RSP: 0018:ffff8880a852fd28 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff88808ecce748 RCX: ffffffff814ca670
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88808ecce750
RBP: ffff8880a852fd40 R08: ffffed101164dec6 R09: ffffed101164dec5
R10: ffffed101164dec5 R11: ffff88808b26f62b R12: 0000000000000000
R13: 0000000000000000 R14: ffff88808ecce748 R15: 0000000000000282
FS:  0000000001d72940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000280 CR3: 00000000894d4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_rcu include/linux/rculist.h:130 [inline]
 xdp_del_sk_umem+0x6f/0x1a0 net/xdp/xdp_umem.c:42
 xsk_release+0x115/0x320 net/xdp/xsk.c:344
 __sock_release+0xc2/0x290 net/socket.c:579
 sock_close+0x10/0x20 net/socket.c:1140
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x416991
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff74d73c40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416991
RDX: 0000001b30c20000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff74d73d30 R11: 0000000000000293 R12: 00000000011908d0
R13: 000000000000c8b3 R14: ffffffffffffffff R15: 000000000118bf2c
Modules linked in:
---[ end trace 36a1465a976abea8 ]---
general protection fault: 0000 [#2] PREEMPT SMP KASAN
RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51
CPU: 1 PID: 7970 Comm: syz-executor.5 Tainted: G      D           4.19.145-syzkaller #0
Code: 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 49 8d 7d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RSP: 0018:ffff8880a852fd28 EFLAGS: 00010046
RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51
RAX: dffffc0000000000 RBX: ffff88808ecce748 RCX: ffffffff814ca670
Code: 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 49 8d 7d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88808ecce750
RSP: 0018:ffff8880a80afd28 EFLAGS: 00010046
RBP: ffff8880a852fd40 R08: ffffed101164dec6 R09: ffffed101164dec5
RAX: dffffc0000000000 RBX: ffff8880a8128808 RCX: ffffffff814ca670
R10: ffffed101164dec5 R11: ffff88808b26f62b R12: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a8128810
R13: 0000000000000000 R14: ffff88808ecce748 R15: 0000000000000282
RBP: ffff8880a80afd40 R08: ffffed1015013abe R09: ffffed1015013abd
FS:  0000000001d72940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
R10: ffffed1015013abd R11: ffff8880a809d5eb R12: 0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
R13: 0000000000000000 R14: ffff8880a8128808 R15: 0000000000000282
CR2: 0000000020000280 CR3: 00000000894d4000 CR4: 00000000001406f0
FS:  00000000027a2940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000280 CR3: 0000000089520000 CR4: 00000000001406e0
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000