syzbot


kernel BUG in mld_newpack

Status: internal: reported on 2022/10/15 10:59
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: d89d7ff01235 ipv6: ensure sane device mtu in tunnels
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 114d, last: 114d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 kernel BUG in add_grec C error 83 315d 389d 2/2 fixed on 2022/03/29 10:01
android-5-15 kernel BUG in mld_newpack 1 82d 82d 0/2 premoderation: reported on 2022/11/16 21:11
android-54 kernel BUG at net/core/skbuff.c:LINE! C 263 8h11m 1121d 0/2 upstream: reported C repro on 2020/01/12 09:43
android-5-10 kernel BUG in add_grec (2) C error inconclusive 1039 75d 75d 0/2 upstream: reported C repro on 2022/11/23 16:35
android-5-10 kernel BUG in cdc_ncm_fill_tx_frame C error 40 407d 473d 1/2 fixed on 2021/12/29 12:20

Sample crash report:
skbuff: skb_over_panic: text:ffff80000b7a2f38 len:40 put:40 head:ffff000149dcf200 data:ffff000149dcf2b0 tail:0xd8 end:0xc0 dev:ip6gretap0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:120!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 10241 Comm: kworker/1:1 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Workqueue: mld mld_ifc_work
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : skb_panic+0x4c/0x50 net/core/skbuff.c:116
lr : skb_panic+0x4c/0x50 net/core/skbuff.c:116
sp : ffff800020dd3b60
x29: ffff800020dd3b70 x28: 0000000000000000 x27: ffff00010df2a800
x26: 00000000000000c0 x25: 00000000000000b0 x24: ffff000149dcf200
x23: 00000000000000c0 x22: 00000000000000d8 x21: ffff80000b7a2f38
x20: ffff00014c2f7800 x19: 0000000000000028 x18: 00000000000001a9
x17: 0000000000000000 x16: ffff80000db49158 x15: ffff000113bf1a80
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000113bf1a80
x11: ff808000081c0d5c x10: 0000000000000000 x9 : 73f125dc5c63ba00
x8 : 73f125dc5c63ba00 x7 : ffff800008161d1c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0001fefddcd0 x1 : 0000000100000000 x0 : 0000000000000089
Call trace:
 skb_panic+0x4c/0x50 net/core/skbuff.c:116
 skb_over_panic net/core/skbuff.c:125 [inline]
 skb_put+0xd4/0xdc net/core/skbuff.c:2049
 ip6_mc_hdr net/ipv6/mcast.c:1714 [inline]
 mld_newpack+0x14c/0x270 net/ipv6/mcast.c:1765
 add_grhead net/ipv6/mcast.c:1851 [inline]
 add_grec+0xa20/0xae0 net/ipv6/mcast.c:1989
 mld_send_cr+0x438/0x5a8 net/ipv6/mcast.c:2115
 mld_ifc_work+0x38/0x290 net/ipv6/mcast.c:2653
 process_one_work+0x2d8/0x504 kernel/workqueue.c:2289
 worker_thread+0x340/0x610 kernel/workqueue.c:2436
 kthread+0x12c/0x158 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 91011400 aa0803e1 a90027ea 94373093 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-gce-arm64 2022/10/15 10:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 67cb024c .config console log report info [disk image] [vmlinux] kernel BUG in mld_newpack
* Struck through repros no longer work on HEAD.