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SubjectRe: [PATCH] block: fix NPE when resuming SCSI devices using blk-mq
On Thu, Jul 26, 2018 at 01:51:48PM +0000, Bart Van Assche wrote:
> On Thu, 2018-07-26 at 10:38 +-0200, Patrick Steinhardt wrote:
> +AD4- That still leaves the other problem of broken suspend. I've just
> +AD4- checked with v4.17.10, and it's still there: as soon as I resume
> +AD4- from suspend, the kernel oopses and reboots the machine. I guess
> +AD4- I'll have to do another debugging session and see where it fails
> +AD4- exactly (and no, this time there are no more changes to the
> +AD4- kernel tree).
>
> Can you share the kernel oops details before you start running a bisect?

I've already done the bisect a few months ago, which resulted in
commit 765e40b675a9 (block: disable runtime-pm for blk-mq July
2017). I've never been able to get the Oops, as the screen was
blank, but I tried a little harder with pstore today and finally
got hold of it. Please see below for the Oops and previous dmesg
entries. Kernel version was v4.17.10.

Thanks
Patrick

<6>[ 49.088931] PM: suspend entry (deep)
<6>[ 49.088933] PM: Syncing filesystems ... done.
<6>[ 49.093066] Freezing user space processes ... (elapsed 0.001 seconds) done.
<6>[ 49.094283] OOM killer disabled.
<6>[ 49.094284] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
<6>[ 49.095470] Suspending console(s) (use no_console_suspend to debug)
<6>[ 50.350548] ACPI: EC: interrupt blocked
<6>[ 50.383913] ACPI: Preparing to enter system sleep state S3
<6>[ 50.397529] ACPI: EC: EC stopped
<6>[ 50.397529] ACPI: EC: event blocked
<6>[ 50.397530] PM: Saving platform NVS memory
<6>[ 50.397605] Disabling non-boot CPUs ...
<6>[ 50.414940] smpboot: CPU 1 is now offline
<6>[ 50.445153] smpboot: CPU 2 is now offline
<6>[ 50.471702] smpboot: CPU 3 is now offline
<6>[ 50.473710] ACPI: Low-level resume complete
<6>[ 50.473770] ACPI: EC: EC started
<6>[ 50.473771] PM: Restoring platform NVS memory
<6>[ 50.476149] Enabling non-boot CPUs ...
<6>[ 50.476175] x86: Booting SMP configuration:
<6>[ 50.476176] smpboot: Booting Node 0 Processor 1 APIC 0x2
<4>[ 50.478031] cache: parent cpu1 should not be sleeping
<6>[ 50.478333] CPU1 is up
<6>[ 50.478348] smpboot: Booting Node 0 Processor 2 APIC 0x1
<4>[ 50.478950] cache: parent cpu2 should not be sleeping
<6>[ 50.479194] CPU2 is up
<6>[ 50.479206] smpboot: Booting Node 0 Processor 3 APIC 0x3
<4>[ 50.479824] cache: parent cpu3 should not be sleeping
<6>[ 50.480470] CPU3 is up
<6>[ 50.490620] ACPI: Waking up from system sleep state S3
<6>[ 53.334256] ACPI: EC: interrupt unblocked
<6>[ 53.411349] ACPI: EC: event unblocked
<1>[ 53.411700] BUG: unable to handle kernel NULL pointer dereference at 00000000000001a8
<6>[ 53.411705] PGD 0 P4D 0
<4>[ 53.411711] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC PTI
<4>[ 53.411716] CPU: 3 PID: 1600 Comm: kworker/u8:48 Tainted: G U 4.17.10 #9
<4>[ 53.411717] Hardware name: Dell Inc. XPS 13 9343/0310JH, BIOS A15 01/23/2018
<4>[ 53.411724] Workqueue: events_unbound async_run_entry_fn
<4>[ 53.411733] RIP: 0010:blk_set_runtime_active+0x2d/0x50
<4>[ 53.411736] RSP: 0000:ffff88020ef37df0 EFLAGS: 00010046
<4>[ 53.411739] RAX: 0000000000000000 RBX: ffff880210a9a000 RCX: 0000000000000000
<4>[ 53.411742] RDX: 00000000fffedf06 RSI: 0000000000000009 RDI: ffff880210a9a1b0
<4>[ 53.411745] RBP: ffffffff815158d0 R08: ffffffff81c13ce0 R09: 0000000000000000
<4>[ 53.411747] R10: 0000000000004400 R11: 0000000000005cd3 R12: ffff8802141671e8
<4>[ 53.411749] R13: 0000000000000000 R14: ffff880215414c98 R15: 0000000000000000
<4>[ 53.411753] FS: 0000000000000000(0000) GS:ffff88021e780000(0000) knlGS:0000000000000000
<4>[ 53.411755] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 53.411757] CR2: 00000000000001a8 CR3: 000000000300a003 CR4: 00000000003606e0
<4>[ 53.411758] Call Trace:
<4>[ 53.411766] scsi_bus_resume_common+0xf8/0x110
<4>[ 53.411771] ? scsi_bus_thaw+0x10/0x10
<4>[ 53.411776] dpm_run_callback.isra.16+0x27/0x70
<4>[ 53.411781] device_resume+0xab/0x170
<4>[ 53.411785] async_resume+0x14/0x40
<4>[ 53.411788] async_run_entry_fn+0x34/0x100
<4>[ 53.411793] process_one_work+0x14d/0x2c0
<4>[ 53.411797] worker_thread+0x29/0x370
<4>[ 53.411800] ? process_one_work+0x2c0/0x2c0
<4>[ 53.411803] kthread+0x109/0x120
<4>[ 53.411806] ? __kthread_create_on_node+0x190/0x190
<4>[ 53.411810] ret_from_fork+0x35/0x40
<4>[ 53.411813] Code: 89 fb 48 8b bf b8 01 00 00 e8 30 8c 4e 00 48 8b 83 40 02 00 00 be 09 00 00 00 c7 83 48 02 00 00 00 00 00 00 48 8b 15 03 31 cf 00 <48> 89 90 a8 01 00 00 48 8b bb 40 02 00 00 e8 00 1e 1e 00 48 8b
<1>[ 53.411873] RIP: blk_set_runtime_active+0x2d/0x50 RSP: ffff88020ef37df0
<4>[ 53.411874] CR2: 00000000000001a8
<4>[ 53.411877] ---[ end trace bbd10b6fcf31d6c4 ]---
[unhandled content-type:application/pgp-signature]
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