bisecting cause commit starting from 0044cdeb731313f20b63cb5644de7588731de32b
building syzkaller on 2f93b54f26aa40233a0a584ce8714e55c8dd159a
testing commit 0044cdeb731313f20b63cb5644de7588731de32b with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in requeue_rx_msgs
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in skb_unlink
run #3: crashed: general protection fault in skb_unlink
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
all runs: OK
# git bisect start 0044cdeb731313f20b63cb5644de7588731de32b v4.16
Bisecting: 7312 revisions left to test after this (roughly 13 steps)
[3a2d7fa8a3d5ae740bd0c21d933acc6220857ed0] mm: disable interrupts while initializing deferred pages
testing commit 3a2d7fa8a3d5ae740bd0c21d933acc6220857ed0 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 3a2d7fa8a3d5ae740bd0c21d933acc6220857ed0
Bisecting: 4320 revisions left to test after this (roughly 12 steps)
[bb2407a7219760926760f0448fddf00d625e5aec] Merge tag 'docs-4.17' of git://git.lwn.net/linux
testing commit bb2407a7219760926760f0448fddf00d625e5aec with gcc (GCC) 8.1.0
all runs: OK
# git bisect good bb2407a7219760926760f0448fddf00d625e5aec
Bisecting: 2342 revisions left to test after this (roughly 11 steps)
[147a89bc71e7db40f011454a40add7ff2d10f8d8] Merge tag 'kconfig-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
testing commit 147a89bc71e7db40f011454a40add7ff2d10f8d8 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in skb_unlink
run #3: crashed: general protection fault in skb_unlink
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 147a89bc71e7db40f011454a40add7ff2d10f8d8
Bisecting: 988 revisions left to test after this (roughly 10 steps)
[32c23b47dbd9765c6ec2542400f41f0d47a7d2c1] i40e: Properly check allowed advertisement capabilities
testing commit 32c23b47dbd9765c6ec2542400f41f0d47a7d2c1 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in requeue_rx_msgs
run #3: crashed: general protection fault in requeue_rx_msgs
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 32c23b47dbd9765c6ec2542400f41f0d47a7d2c1
Bisecting: 494 revisions left to test after this (roughly 9 steps)
[937eeb3482748bb85486070e10b5fbeb6b973f63] selftests: forwarding: Create test topology for multipath routing
testing commit 937eeb3482748bb85486070e10b5fbeb6b973f63 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in skb_unlink
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 937eeb3482748bb85486070e10b5fbeb6b973f63
Bisecting: 246 revisions left to test after this (roughly 8 steps)
[86f669b2b7491b5697d9e63538c960ad7e94c6cc] ibmvnic: Make napi usage dynamic
testing commit 86f669b2b7491b5697d9e63538c960ad7e94c6cc with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in requeue_rx_msgs
run #2: crashed: general protection fault in skb_unlink
run #3: crashed: general protection fault in skb_unlink
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 86f669b2b7491b5697d9e63538c960ad7e94c6cc
Bisecting: 123 revisions left to test after this (roughly 7 steps)
[93707cbabcc8baf2b2b5f4a99c1f08ee83eb7abd] tools: tc-testing: Introduce plugin architecture
testing commit 93707cbabcc8baf2b2b5f4a99c1f08ee83eb7abd with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 93707cbabcc8baf2b2b5f4a99c1f08ee83eb7abd
Bisecting: 61 revisions left to test after this (roughly 6 steps)
[8c2ceabe99e04005cadba739856eed6953a8a3af] net/ipv4: Unexport fib_multipath_hash and fib_select_path
testing commit 8c2ceabe99e04005cadba739856eed6953a8a3af with gcc (GCC) 8.1.0
run #0: OK
run #1: OK
run #2: crashed: general protection fault in skb_unlink
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 8c2ceabe99e04005cadba739856eed6953a8a3af
Bisecting: 30 revisions left to test after this (roughly 5 steps)
[15898a011b3d0390869f31167c4403835bc04954] net: Convert uevent_net_ops
testing commit 15898a011b3d0390869f31167c4403835bc04954 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 15898a011b3d0390869f31167c4403835bc04954
Bisecting: 14 revisions left to test after this (roughly 4 steps)
[98f6c533a3e98f21305575f0cf87cdb6c2210c43] net: Assign net to net_namespace_list in setup_net()
testing commit 98f6c533a3e98f21305575f0cf87cdb6c2210c43 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 98f6c533a3e98f21305575f0cf87cdb6c2210c43
Bisecting: 7 revisions left to test after this (roughly 3 steps)
[8b99b1179c27958f51ecfc489af5f459f9408d96] i40e/i40evf: Clean-up of bits related to using q_vector->reg_idx
testing commit 8b99b1179c27958f51ecfc489af5f459f9408d96 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in requeue_rx_msgs
run #2: crashed: general protection fault in skb_unlink
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: crashed: general protection fault in skb_unlink
run #9: OK
# git bisect bad 8b99b1179c27958f51ecfc489af5f459f9408d96
Bisecting: 3 revisions left to test after this (roughly 2 steps)
[71dc371993625b4b1ae26214af74427765bfa3a2] i40e/i40evf: Clean up logic for adaptive ITR
testing commit 71dc371993625b4b1ae26214af74427765bfa3a2 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in requeue_rx_msgs
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 71dc371993625b4b1ae26214af74427765bfa3a2
Bisecting: 0 revisions left to test after this (roughly 1 step)
[40588ca6513729e4de60e49896aab0a7ee09df19] i40e/i40evf: Only track one ITR setting per ring instead of Tx/Rx
testing commit 40588ca6513729e4de60e49896aab0a7ee09df19 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in skb_unlink
run #3: crashed: general protection fault in requeue_rx_msgs
run #4: crashed: general protection fault in skb_unlink
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 40588ca6513729e4de60e49896aab0a7ee09df19
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[11a350c965cc5ac2f5d0ed1fb336735a0c1a6344] i40e: fix typo in function description
testing commit 11a350c965cc5ac2f5d0ed1fb336735a0c1a6344 with gcc (GCC) 8.1.0
run #0: crashed: general protection fault in skb_unlink
run #1: crashed: general protection fault in skb_unlink
run #2: crashed: general protection fault in skb_unlink
run #3: crashed: general protection fault in skb_unlink
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 11a350c965cc5ac2f5d0ed1fb336735a0c1a6344
11a350c965cc5ac2f5d0ed1fb336735a0c1a6344 is the first bad commit
commit 11a350c965cc5ac2f5d0ed1fb336735a0c1a6344
Author: Alan Brady <alan.brady@intel.com>
Date:   Fri Dec 29 08:48:33 2017 -0500

    i40e: fix typo in function description
    
    'bufer' should be 'buffer'
    
    Signed-off-by: Alan Brady <alan.brady@intel.com>
    Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

:040000 040000 b880e7ff9eb9ab1e501699e5e1490bb243e360b6 845e6490ca6ca736316382bad9d3672a2a1941dc M	drivers
revisions tested: 16, total time: 4h13m21.143946433s (build: 1h18m27.469586217s, test: 2h50m11.041596216s)
first bad commit: 11a350c965cc5ac2f5d0ed1fb336735a0c1a6344 i40e: fix typo in function description
cc: ["alan.brady@intel.com" "andrewx.bowers@intel.com" "intel-wired-lan@lists.osuosl.org" "jeffrey.t.kirsher@intel.com" "linux-kernel@vger.kernel.org" "netdev@vger.kernel.org"]
crash: general protection fault in skb_unlink
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 0 PID: 15053 Comm: syz-executor2 Not tainted 4.15.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__skb_unlink include/linux/skbuff.h:1840 [inline]
RIP: 0010:skb_unlink+0xbb/0x160 net/core/skbuff.c:2918
RSP: 0018:ffff8801cabd7708 EFLAGS: 00010002
RAX: 0000000000000286 RBX: ffff8801c40951c0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffff8801c8e20e20 RDI: 0000000000000008
RBP: ffff8801cabd7730 R08: 0000000000000008 R09: 000000000000647f
R10: 9e6c8576b0ae2bba R11: ffff8801c8e20580 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801d2b8c7e0 R15: 0000000000000000
FS:  00007ff821fea700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc895637f8 CR3: 00000001d095a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kcm_recvmsg+0x3e3/0x5d0 net/kcm/kcmsock.c:1160
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0xb9/0xf0 net/socket.c:810
 ___sys_recvmsg+0x257/0x710 net/socket.c:2205
 __sys_recvmmsg+0x277/0xa90 net/socket.c:2313
 SYSC_recvmmsg net/socket.c:2394 [inline]
 SyS_recvmmsg+0xae/0x130 net/socket.c:2378
 do_syscall_64+0x270/0x970 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x455b59
RSP: 002b:00007ff821fe9c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007ff821fea6d4 RCX: 0000000000455b59
RDX: 00000000040000f7 RSI: 00000000200002c0 RDI: 0000000000000006
RBP: 000000000072bea0 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000060 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000574 R14: 00000000006fd380 R15: 0000000000000000
Code: 00 00 00 49 8d 7d 08 4c 8b 63 08 48 ba 00 00 00 00 00 fc ff df 48 c7 43 08 00 00 00 00 48 89 f9 48 c7 03 00 00 00 00 48 c1 e9 03 <80> 3c 11 00 75 5b 4c 89 e1 4d 89 65 08 48 ba 00 00 00 00 00 fc 
RIP: __skb_unlink include/linux/skbuff.h:1840 [inline] RSP: ffff8801cabd7708
RIP: skb_unlink+0xbb/0x160 net/core/skbuff.c:2918 RSP: ffff8801cabd7708
---[ end trace ebbe78980939364a ]---