Re: Crash in base/head in abd_put() after r320156

On Tue, 20 Jun 2017 17:31-0400, Allan Jude wrote:

> On 2017-06-20 17:27, Trond Endrestøl wrote:
> > Has anyone else seen a crash in base/head in abd_put() after r320156?
> > 
> > One of my experimental VMs at home crashed spectacularly after 
> > upgrading to r320156. I even wiped my /usr/obj, recompiled everything 
> > and got the same result. Everything's back to normal when I boot 
> > r320146.
> > 
> > Here's the backtrace:
> > 
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 3; apic id = 03
> > 
> > fault virtual address	= 0x8
> > 
> > Fatal trap 12: page fault while in kernel mode
> > 
> > cpuid = 2; 
> > Fatal trap 12: page fault while in kernel mode
> > apic id = 02
> > fault virtual address	= 0x8
> > cpuid = 0; apic id = 00
> > fault virtual address	= 0x8
> > fault code		= supervisor read data, page not present
> > fault code		= supervisor read data, page not present
> > instruction pointer	= 0x20:0xffffffff803260fa
> > stack pointer	        = 0x28:0xfffffe01b0231860
> > frame pointer	        = 0x28:0xfffffe01b0231870
> > code segment		= base 0x0, limit 0xfffff, type 0x1b
> > 
> > 			= DPL 0, pres 1, long 1, def32 0, gran 1
> > 
> > Fatal trap 12: page fault while in kernel mode
> > fault code		= supervisor read data, page not present
> > processor eflags	= interrupt enabled, resume, IOPL = 0
> > current process		= 0 (zio_free_issue_5_2)
> > trap number		= 12
> > instruction pointer	= 0x20:0xffffffff803260fa
> > stack pointer	        = 0x28:0xfffffe01b022c860
> > frame pointer	        = 0x28:0xfffffe01b022c870
> > panic: page fault
> > cpuid = 0
> > time = 4
> > KDB: stack backtrace:
> > db_trace_self_wrapper() at 0xffffffff8044f93b = db_trace_self_wrapper+0x2b/frame 0xfffffe01b0231440
> > vpanic() at 0xffffffff8067ec0c = vpanic+0x19c/frame 0xfffffe01b02314c0
> > panic() at 0xffffffff8067ea63 = panic+0x43/frame 0xfffffe01b0231520
> > trap_fatal() at 0xffffffff80983b32 = trap_fatal+0x322/frame 0xfffffe01b0231570
> > trap_pfault() at 0xffffffff80983b89 = trap_pfault+0x49/frame 0xfffffe01b02315d0
> > trap() at 0xffffffff809833c5 = trap+0x295/frame 0xfffffe01b0231790
> > calltrap() at 0xffffffff80968c21 = calltrap+0x8/frame 0xfffffe01b0231790
> > --- trap 0xc, rip = 0xffffffff803260fa, rsp = 0xfffffe01b0231860, rbp = 0xfffffe01b0231870 ---
> > abd_put() at 0xffffffff803260fa = abd_put+0xa/frame 0xfffffe01b0231870
> > vdev_raidz_map_free() at 0xffffffff803aa7c2 = vdev_raidz_map_free+0x82/frame 0xfffffe01b02318a0
> > zio_vdev_io_assess() at 0xffffffff803ecc04 = zio_vdev_io_assess+0x74/frame 0xfffffe01b02318e0
> > zio_execute() at 0xffffffff803e913c = zio_execute+0xac/frame 0xfffffe01b0231930
> > zio_vdev_io_start() at 0xffffffff803ec894 = zio_vdev_io_start+0x2b4/frame 0xfffffe01b0231990
> > zio_execute() at 0xffffffff803e913c = zio_execute+0xac/frame 0xfffffe01b02319e0
> > zio_nowait() at 0xffffffff803e8a8b = zio_nowait+0xcb/frame 0xfffffe01b0231a20
> > vdev_mirror_io_start() at 0xffffffff803a744c = vdev_mirror_io_start+0x35c/frame 0xfffffe01b0231a70
> > zio_vdev_io_start() at 0xffffffff803ec86c = zio_vdev_io_start+0x28c/frame 0xfffffe01b0231ad0
> > zio_execute() at 0xffffffff803e913c = zio_execute+0xac/frame 0xfffffe01b0231b20
> > taskqueue_run_locked() at 0xffffffff806d3d27 = taskqueue_run_locked+0x127/frame 0xfffffe01b0231b80
> > taskqueue_thread_loop() at 0xffffffff806d4ee8 = taskqueue_thread_loop+0xc8/frame 0xfffffe01b0231bb0
> > fork_exit() at 0xffffffff80640df5 = fork_exit+0x85/frame 0xfffffe01b0231bf0
> > fork_trampoline() at 0xffffffff8096915e = fork_trampoline+0xe/frame 0xfffffe01b0231bf0
> > --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
> > Uptime: 4s
> > 
> 
> This seems to be an unintended consequence of some code that was pulled
> in from upstream today.
> 
> Try adding: vfs.zfs.trim.enabled=0
> to /boot/loader.conf
> 
> (you can set it manually from the boot loader menu with the set command
> to get the system to boot)

That worked. Thanks.

BTW, the call to abd_put() was given a NULL pointer.

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