On 22 Dec 2025, at 1:38, Ka Ho Ng wrote:
The branch stable/15 has been updated by khng:
URL:
https://cgit.FreeBSD.org/src/commit/?id=112c453ba91012f19ed140c56a3ac8fc929ddabb
commit 112c453ba91012f19ed140c56a3ac8fc929ddabb
Author: Ka Ho Ng <[email protected]>
AuthorDate: 2025-12-21 22:45:03 +0000
Commit: Ka Ho Ng <[email protected]>
CommitDate: 2025-12-22 00:37:40 +0000
geom(9): struct bio KBI fix
The struct bio was changed after cb85c2e2e995 on the branch. To
fix
this, move BIO_ERROR flag to another value, and now
BIO_ERROR_COMPAT
occupies 0x1 instead. Also, introduce b_error_compat field at the
place
where the old bio_error was.
This allows non-CAM(9) disk drivers and software volume manager
modules
compiled against 15.0-RELEASE kernel to work on 15-STABLE kernel
again.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D54327
Approved by: re (cperciva)
I’m seeing panics on boot now:
vtnet0: Ethernet address: 58:9c:fc:0c:60:85
vtnet0: netmap queues/slots: TX 1/1024, RX 1panic: Memory modified
after free 0xfffff800038b51a8 (424, g_bio) + 0 = deadc0dedeacc0de
cpuid = 6
time = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe008d5679a0
vpanic() at vpanic+0x136/frame 0xfffffe008d567ad0
panic() at panic+0x43/frame 0xfffffe008d567b30
trash_ctor() at trash_ctor+0x74/frame 0xfffffe008d567b40
item_ctor() at item_ctor+0x59/frame 0xfffffe008d567b90
g_clone_bio() at g_clone_bio+0x1d/frame 0xfffffe008d567bb0
g_part_start() at g_part_start+0x96/frame 0xfffffe008d567c40
g_io_request() at g_io_request+0x2ca/frame 0xfffffe008d567c70
g_read_data() at g_read_data+0x95/frame 0xfffffe008d567cb0
g_raid_md_taste_intel() at g_raid_md_taste_intel+0x1d8/frame
0xfffffe008d567e50
g_raid_taste() at g_raid_taste+0x18e/frame 0xfffffe008d567ea0
g_new_provider_event() at g_new_provider_event+0xaa/frame
0xfffffe008d567ec0
g_run_events() at g_run_events+0x104/frame 0xfffffe008d567ef0
fork_exit() at fork_exit+0x82/frame 0xfffffe008d567f30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe008d567f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 13 tid 100069 ]
Stopped at kdb_enter+0x33: movq $0,0x121aa92(%rip)
db>
With this commit (and the follow-up “geom(9): unset the
BIO_ERROR_COMPAT flag correctly”) reverted the VM boots again.
Best regards,
Kristof
