Date: Sun, 07 May 2023 04:51:29 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 271292] kernel panic while dd'ing a USB disk to a ZFS directory Message-ID: <bug-271292-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D271292 Bug ID: 271292 Summary: kernel panic while dd'ing a USB disk to a ZFS directory Product: Base System Version: CURRENT Hardware: riscv OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: dgilbert@eicat.ca Created attachment 242030 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D242030&action= =3Dedit core.txt file for the crash I was using my RISC-V unleashed (running -CURRENT) to dd copy an NVME disk using a USB enclosure. The crash message was unhelpful: Unread portion of the kernel message buffer: panic: buffer modified while frozen! cpuid =3D 0 time =3D 1683224304 KDB: stack backtrace: db_trace_self() at db_trace_self db_trace_self_wrapper() at db_trace_self_wrapper+0x38 kdb_backtrace() at kdb_backtrace+0x2c vpanic() at vpanic+0x126 panic() at panic+0x2a .LBB9_21() at .LBB9_21+0xc arc_write_done() at arc_write_done+0x4e .LBB84_358() at .LBB84_358+0xcc .LBB41_60() at .LBB41_60+0xbc taskqueue_run_locked() at taskqueue_run_locked+0x90 taskqueue_thread_loop() at taskqueue_thread_loop+0xd4 fork_exit() at fork_exit+0x68 fork_trampoline() at fork_trampoline+0xa KDB: enter: panic With slightly more information coming from the kgdb output from panic() dow= n: #12 0xffffffc002cc363a in arc_cksum_verify (buf=3D<optimized out>) at /usr/src/sys/contrib/openzfs/module/zfs/arc.c:1475 #13 0xffffffc002ccfc48 in arc_write_done (zio=3D0xffffffd0df9839c0) at /usr/src/sys/contrib/openzfs/module/zfs/arc.c:6725 #14 0xffffffc002dfbd16 in zio_done (zio=3D0xffffffd0df9839c0) at /usr/src/sys/contrib/openzfs/module/zfs/zio.c:4893 #15 0xffffffc002df48ae in __zio_execute (zio=3D0xffffffd0df9839c0) at /usr/src/sys/contrib/openzfs/module/zfs/zio.c:2233 #16 zio_execute (zio=3D<optimized out>) at /usr/src/sys/contrib/openzfs/module/zfs/zio.c:2144 #17 0xffffffc000350bc4 in taskqueue_run_locked (queue=3D0xffffffd01539c000) at /usr/src/sys/kern/subr_taskqueue.c:514 #18 0xffffffc000351a2c in taskqueue_thread_loop (arg=3D<optimized out>) at /usr/src/sys/kern/subr_taskqueue.c:826 #19 0xffffffc0002b8f90 in fork_exit ( callout=3D0xffffffc000351954 <taskqueue_thread_loop>,=20 arg=3D0xffffffd00318df40, frame=3D0xffffffc1fa399c40) at /usr/src/sys/kern/kern_fork.c:1102 #20 0xffffffc0005b069e in fork_trampoline () at /usr/src/sys/riscv/riscv/swtch.S:385 Backtrace stopped: frame did not save the PC coredump, kernel and debug symbols will appear here as I upload them: https://v4.nextcloud.towernet.ca/s/NkD6E4Bd7TAQdGH --=20 You are receiving this mail because: You are the assignee for the bug.=
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