[Bug 242839] zfs spa_condense_indirect_start_sync panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242839

            Bug ID: 242839
           Summary: zfs spa_condense_indirect_start_sync panic
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gldisater at gmail.com

zfs destroy'd a dataset that was on a pool that had previously had drives
removed from it caused the system to panic. Now it is unable to boot while that
pool is present. In single user mode it will panic if that pool is touched in
any way by zpool/zfs commands.

constans% uname -a
FreeBSD constans 12.1-STABLE FreeBSD 12.1-STABLE #34 r355756M: Sat Dec 14
17:25:31 EST 2019     root at constans:/usr/obj/usr/src/amd64.amd64/sys/GENERIC 
amd64

screenshot:
https://drive.google.com/open?id=1JrNjoP_SuiK1KOA9b9fMy9Yx0D1YWKhE

tar zcvf core-dump-spa-condense-indirect-start-sync.tar.gz /boot/kernel
/var/crash /usr/lib/debug/boot/kernel
https://drive.google.com/open?id=1qfZin11byCG7p0W50adb5FH12BaY6Huf

<118># mount
<118>zroot/ROOT/12 on / (zfs, local, noatime, read-only, nfsv4acls)
<118>devfs on /dev (devfs, local, multilabel)
<118># zpool status mercury


Fatal trap 12: page fault while in kernel mode
cpuid = 7; apic id = 15
fault virtual address   = 0x40
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff825b99ee
stack pointer           = 0x28:0xfffffe00e380d980
frame pointer           = 0x28:0xfffffe00e380d9a0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 26 (txg_thread_enter)
trap number             = 12
panic: page fault
cpuid = 7
time = 1577119472
KDB: stack backtrace:
#0 0xffffffff80c15ab7 at kdb_backtrace+0x67
#1 0xffffffff80bc932d at vpanic+0x19d
#2 0xffffffff80bc9183 at panic+0x43
#3 0xffffffff810a083c at trap_fatal+0x39c
#4 0xffffffff810a088f at trap_pfault+0x4f
#5 0xffffffff8109fec1 at trap+0x2a1
#6 0xffffffff810792fc at calltrap+0x8
#7 0xffffffff8258296a at spa_condense_indirect_start_sync+0x1fa
#8 0xffffffff82569307 at spa_sync+0x5b7
#9 0xffffffff82576ed8 at txg_sync_thread+0x238
#10 0xffffffff80b89cb2 at fork_exit+0x82
#11 0xffffffff8107a34e at fork_trampoline+0xe
Uptime: 2m28s
Dumping 2660 out of 73677 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb)

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