kernel panic: Fatal exception (3)

Status: fixed on 2020/11/16 12:12
Reported-by: syzbot+ec762a6342ad0d3c0d8f@syzkaller.appspotmail.com
Fix commit: eadd1befdd77 netem: fix zero division in tabledist
First crash: 2131d, last: 2129d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: divide error in tabledist (log)
Repro: C syz .config
  
▶ ▼ Discussions (7)
Title Replies (including bot) Last reply
[PATCH 4.19 000/191] 4.19.155-rc1 review 218 (218) 2020/11/18 18:02
[PATCH 5.9 00/74] 5.9.3-rc1 review 85 (85) 2020/11/03 07:54
[PATCH 5.8 00/70] 5.8.18-rc1 review 73 (73) 2020/11/01 07:19
[PATCH 5.4 00/49] 5.4.74-rc1 review 51 (51) 2020/10/31 11:42
[PATCH v2] netem: fix zero division in tabledist 3 (3) 2020/10/29 18:46
[PATCH] netem: prevent division by zero in tabledist 2 (2) 2020/10/16 15:53
kernel panic: Fatal exception (3) 0 (1) 2020/10/14 20:12
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel panic: Fatal exception (4) prio:high 2 syz, C error inconclusive 99 413d 438d 0/29 upstream: reported C repro on 2025/05/31 13:19
upstream kernel panic: Fatal exception hardening mm 2 1 3232d 3232d 0/29 closed as invalid on 2017/10/18 09:51
upstream kernel panic: Fatal exception (2) 2 syz, C done 11 2180d 2208d 0/29 closed as dup on 2020/07/26 02:43

Sample crash report:
FS:  0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c7328 CR3: 0000000009e8d000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Kernel panic - not syncing: Fatal exception in interrupt
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/10/13 07:22 net-old 8098bd69bc4e d32b0bbf .config console log report syz C ci-upstream-net-this-kasan-gce
2020/10/10 20:03 net-next-old c77fb07fae36 4a77ae0b .config console log report syz C ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.