syzbot


pool: free list modified: mbufpl (6)

Status: upstream: reported on 2026/03/13 12:12
Reported-by: syzbot+d1ee6fa33c143124fc6d@syzkaller.appspotmail.com
First crash: 8d03h, last: 8d03h
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd pool: free list modified: mbufpl (3) -1 1 883d 883d 0/3 auto-obsoleted due to no activity on 2024/01/18 14:10
openbsd pool: free list modified: mbufpl (5) -1 1 112d 112d 0/3 auto-obsoleted due to no activity on 2026/02/27 02:55
openbsd pool: free list modified: mbufpl (4) -1 1 687d 687d 0/3 auto-obsoleted due to no activity on 2024/07/31 23:52
openbsd pool: free list modified: mbufpl -1 syz 13 2650d 2664d 3/3 fixed on 2019/01/06 10:35
openbsd pool: free list modified: mbufpl (2) -1 syz 1781 2054d 2383d 0/3 closed as dup on 2020/05/08 06:40

Sample crash report:
panic: pool_p_free: mbufpl free list modified: page 0xfffffd806a11d000; item addr 0xfffffd806a11d100; offset 0x0=0x0
Starting stack trace...
panic(ffffffff833e9328) at panic+0x1ba sys/kern/subr_prf.c:229
pool_p_free(ffffffff839552f0,fffffd806ba1ad28) at pool_p_free+0x28c sys/kern/subr_pool.c:1009
pool_reclaim(ffffffff839552f0) at pool_reclaim+0x2c2 sys/kern/subr_pool.c:1156
pool_reclaim_all() at pool_reclaim_all+0x48 sys/kern/subr_pool.c:-1
kern_sysctl(ffff80003c94d614,1,0,ffff80003c94d648,200000001440,4,8fc5b46d79b025c8) at kern_sysctl+0x1094 sys/kern/kern_sysctl.c:687
sys_sysctl(ffff8000324d4fb8,ffff80003c94d770,ffff80003c94d6c0) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1
syscall(ffff80003c94d770) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c94d770) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2d1776f82c0, count: 249
End of stack trace.

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/13 12:11 openbsd fd49698d88e5 2f7f359d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main pool: free list modified: mbufpl
* Struck through repros no longer work on HEAD.