general protection fault in free_verifier_state (3)
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syzbot
Jan 15, 2020, 1:25:10 AM1/15/20
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Hello,
syzbot found the following crash on:
HEAD commit: 6dd42aa1 Merge branch 'runqslower'
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14e61349e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b29657...@syzkaller.appspotmail.com
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3213 Comm: syz-executor.2 Not tainted 5.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8
e8 65 ae f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00
0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RSP: 0018:ffffc900017c7688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000d65b000
RDX: 0000000000040000 RSI: ffffffff818251eb RDI: 0000000000000000
RBP: ffffc900017c76d0 R08: ffff88806f496640 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fdb4648e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000010f6e80 CR3: 00000000690e9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
do_check_common+0x2ec7/0x9650 kernel/bpf/verifier.c:9597
do_check_main kernel/bpf/verifier.c:9654 [inline]
bpf_check+0x84ed/0xbb07 kernel/bpf/verifier.c:10009
bpf_prog_load+0xeab/0x17f0 kernel/bpf/syscall.c:1859
__do_sys_bpf+0x1269/0x37a0 kernel/bpf/syscall.c:3096
__se_sys_bpf kernel/bpf/syscall.c:3055 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3055
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdb4648dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000024 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdb4648e6d4
R13: 00000000004c1697 R14: 00000000004d66a0 R15: 00000000ffffffff
Modules linked in:
---[ end trace d725571ef2f4cce3 ]---
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8
e8 65 ae f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00
0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RSP: 0018:ffffc900017c7688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000d65b000
RDX: 0000000000040000 RSI: ffffffff818251eb RDI: 0000000000000000
RBP: ffffc900017c76d0 R08: ffff88806f496640 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fdb4648e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000000690e9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 6dd42aa1 Merge branch 'runqslower'
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14e61349e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b29657...@syzkaller.appspotmail.com
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3213 Comm: syz-executor.2 Not tainted 5.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8
e8 65 ae f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00
0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RSP: 0018:ffffc900017c7688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000d65b000
RDX: 0000000000040000 RSI: ffffffff818251eb RDI: 0000000000000000
RBP: ffffc900017c76d0 R08: ffff88806f496640 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fdb4648e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000010f6e80 CR3: 00000000690e9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
do_check_common+0x2ec7/0x9650 kernel/bpf/verifier.c:9597
do_check_main kernel/bpf/verifier.c:9654 [inline]
bpf_check+0x84ed/0xbb07 kernel/bpf/verifier.c:10009
bpf_prog_load+0xeab/0x17f0 kernel/bpf/syscall.c:1859
__do_sys_bpf+0x1269/0x37a0 kernel/bpf/syscall.c:3096
__se_sys_bpf kernel/bpf/syscall.c:3055 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3055
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdb4648dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000024 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdb4648e6d4
R13: 00000000004c1697 R14: 00000000004d66a0 R15: 00000000ffffffff
Modules linked in:
---[ end trace d725571ef2f4cce3 ]---
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8
e8 65 ae f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00
0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RSP: 0018:ffffc900017c7688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000d65b000
RDX: 0000000000040000 RSI: ffffffff818251eb RDI: 0000000000000000
RBP: ffffc900017c76d0 R08: ffff88806f496640 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fdb4648e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000000690e9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jan 21, 2020, 2:05:11 PM1/21/20
to and...@fb.com, a...@kernel.org, b...@vger.kernel.org, clang-bu...@googlegroups.com, dan...@iogearbox.net, da...@davemloft.net, ha...@kernel.org, jakub.k...@netronome.com, john.fa...@gmail.com, ka...@fb.com, linux-...@vger.kernel.org, net...@vger.kernel.org, songliu...@fb.com, syzkall...@googlegroups.com, y...@fb.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 2e3a94aa bpf: Fix memory leaks in generic update/delete ba..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15aefc6ee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1411544ee00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b29657...@syzkaller.appspotmail.com
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000000000048 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00000000006cc018 R08: 0000000000000002 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280
R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000
RSP: 0018:ffffc90002007688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8184dd58
RDX: 0000000000000000 RSI: ffffffff8182644b RDI: 0000000000000000
RBP: ffffc900020076d0 R08: ffff888098656280 R09: 0000000000000000
__do_sys_bpf+0x1521/0x41e0 kernel/bpf/syscall.c:3387
__se_sys_bpf kernel/bpf/syscall.c:3346 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3346
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441339
Code: e8 5c ae 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe7971f348 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000000000048 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00000000006cc018 R08: 0000000000000002 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280
R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace af38d247c1b207c2 ]---
RSP: 0018:ffffc90002007688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8184dd58
RDX: 0000000000000000 RSI: ffffffff8182644b RDI: 0000000000000000
RBP: ffffc900020076d0 R08: ffff888098656280 R09: 0000000000000000
HEAD commit: 2e3a94aa bpf: Fix memory leaks in generic update/delete ba..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15aefc6ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a4280de00000
dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1411544ee00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b29657...@syzkaller.appspotmail.com
RDX: 0000000000000048 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00000000006cc018 R08: 0000000000000002 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280
R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9996 Comm: syz-executor310 Not tainted 5.5.0-rc4-syzkaller #0
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8 e8 05 9c f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
RSP: 0018:ffffc90002007688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8184dd58
RDX: 0000000000000000 RSI: ffffffff8182644b RDI: 0000000000000000
RBP: ffffc900020076d0 R08: ffff888098656280 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000000000236b880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000098345000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_check_common+0x2ec7/0x9650 kernel/bpf/verifier.c:9597
do_check_main kernel/bpf/verifier.c:9654 [inline]
bpf_check+0x84ed/0xbb07 kernel/bpf/verifier.c:10009
bpf_prog_load+0xeab/0x17f0 kernel/bpf/syscall.c:2095
do_check_common+0x2ec7/0x9650 kernel/bpf/verifier.c:9597
do_check_main kernel/bpf/verifier.c:9654 [inline]
bpf_check+0x84ed/0xbb07 kernel/bpf/verifier.c:10009
__do_sys_bpf+0x1521/0x41e0 kernel/bpf/syscall.c:3387
__se_sys_bpf kernel/bpf/syscall.c:3346 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3346
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441339
Code: e8 5c ae 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe7971f348 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000000000048 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00000000006cc018 R08: 0000000000000002 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280
R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace af38d247c1b207c2 ]---
RIP: 0010:free_verifier_state+0x49/0x1d0 kernel/bpf/verifier.c:744
Code: db 48 83 ec 20 48 89 45 b8 48 c1 e8 03 4c 01 f8 89 75 c4 48 89 45 c8 e8 05 9c f2 ff 4c 63 f3 4f 8d 2c f4 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 2b 01 00 00 4f 8d 34 f4 49 8b 3e 48 85 ff 48
RSP: 0018:ffffc90002007688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8184dd58
RDX: 0000000000000000 RSI: ffffffff8182644b RDI: 0000000000000000
RBP: ffffc900020076d0 R08: ffff888098656280 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000000000236b880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000098345000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Alexei Starovoitov
Jan 21, 2020, 2:16:46 PM1/21/20
to syzbot, Andrii Nakryiko, Alexei Starovoitov, bpf, Clang-Built-Linux ML, Daniel Borkmann, David S. Miller, Jesper Dangaard Brouer, Jakub Kicinski, John Fastabend, Martin KaFai Lau, LKML, Network Development, Song Liu, syzkaller-bugs, Yonghong Song
On Tue, Jan 21, 2020 at 11:05 AM syzbot
<syzbot+b29657...@syzkaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit: 2e3a94aa bpf: Fix memory leaks in generic update/delete ba..
> git tree: bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15aefc6ee00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
> dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a4280de00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1411544ee00000
Since it's in the verifier I'm guessing it's related to some of my
<syzbot+b29657...@syzkaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit: 2e3a94aa bpf: Fix memory leaks in generic update/delete ba..
> git tree: bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15aefc6ee00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
> dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a4280de00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1411544ee00000
earlier patches.
I'll try to take a look soon.
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