Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 8107f5f540ff2700d9b300343ccbd3368970cf40 ("[PATCH] block/genhd: use atomic_t for disk_event->block") url: https://github.com/0day-ci/linux/commits/Hannes-Reinecke/block-genhd-use-... base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git for-next in testcase: boot on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-----------------------------------------------+------------+------------+ | | 3fc19ec343 | 8107f5f540 | +-----------------------------------------------+------------+------------+ | boot_successes | 10 | 0 | | boot_failures | 0 | 6 | | WARNING:bad_unlock_balance_detected | 0 | 6 | | is_trying_to_release_lock(&ev->block_mutex)at | 0 | 6 | | calltrace:__disk_unblock_events | 0 | 6 | +-----------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 65.041606] WARNING: bad unlock balance detected! [ 65.042098] 5.13.0-rc3-00039-g8107f5f540ff #1 Not tainted [ 65.042660] ------------------------------------- [ 65.043157] kworker/u4:5/139 is trying to release lock (&ev->block_mutex) at: [ 65.043913] __disk_unblock_events (kbuild/src/consumer/block/genhd.c:1477) [ 65.044130] but there are no more locks to release! [ 65.044130] [ 65.044130] other info that might help us debug this: [ 65.044130] 2 locks held by kworker/u4:5/139: [ 65.044130] #0: 410078b8 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work (kbuild/src/consumer/kernel/workqueue.c:615 kbuild/src/consumer/kernel/workqueue.c:643 kbuild/src/consumer/kernel/workqueue.c:2246) [ 65.044130] #1: 4264df34 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work (kbuild/src/consumer/kernel/workqueue.c:615 kbuild/src/consumer/kernel/workqueue.c:643 kbuild/src/consumer/kernel/workqueue.c:2246) [ 65.044130] [ 65.044130] stack backtrace: [ 65.044130] CPU: 1 PID: 139 Comm: kworker/u4:5 Not tainted 5.13.0-rc3-00039-g8107f5f540ff #1 [ 65.044130] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 65.044130] Workqueue: events_unbound async_run_entry_fn [ 65.044130] Call Trace: [ 65.044130] ? dump_stack (kbuild/src/consumer/lib/dump_stack.c:122) [ 65.044130] ? __disk_unblock_events (kbuild/src/consumer/block/genhd.c:1477) [ 65.052205] ? print_unlock_imbalance_bug.cold (kbuild/src/consumer/kernel/locking/lockdep.c:4955 kbuild/src/consumer/kernel/locking/lockdep.c:4931) [ 65.052205] ? __disk_unblock_events (kbuild/src/consumer/block/genhd.c:1477) [ 65.052205] ? lock_release (kbuild/src/consumer/kernel/locking/lockdep.c:5192 kbuild/src/consumer/kernel/locking/lockdep.c:5532) [ 65.052205] ? __mutex_unlock_slowpath (kbuild/src/consumer/arch/x86/include/asm/atomic.h:29 kbuild/src/consumer/include/asm-generic/atomic-instrumented.h:28 kbuild/src/consumer/include/asm-generic/atomic-long.h:523 kbuild/src/consumer/kernel/locking/mutex.c:1238) [ 65.052205] ? mutex_unlock (kbuild/src/consumer/kernel/locking/mutex.c:741) [ 65.052205] ? __disk_unblock_events (kbuild/src/consumer/block/genhd.c:1477) [ 65.052205] ? __device_add_disk (kbuild/src/consumer/block/genhd.c:565) [ 65.052205] ? device_add_disk (kbuild/src/consumer/block/genhd.c:572) [ 65.052205] ? do_floppy_init (kbuild/src/consumer/drivers/block/floppy.c:4704) [ 65.052205] ? ktime_get (kbuild/src/consumer/kernel/time/timekeeping.c:831) [ 65.052205] ? floppy_async_init (kbuild/src/consumer/drivers/block/floppy.c:4742) [ 65.052205] ? async_run_entry_fn (kbuild/src/consumer/kernel/async.c:134) [ 65.052205] ? process_one_work (kbuild/src/consumer/arch/x86/include/asm/atomic.h:29 kbuild/src/consumer/include/asm-generic/atomic-instrumented.h:28 kbuild/src/consumer/include/linux/jump_label.h:254 kbuild/src/consumer/include/linux/jump_label.h:264 kbuild/src/consumer/include/trace/events/workqueue.h:108 kbuild/src/consumer/kernel/workqueue.c:2280) [ 65.052205] ? worker_thread (kbuild/src/consumer/include/linux/list.h:282 kbuild/src/consumer/kernel/workqueue.c:2422) [ 65.052205] ? kthread (kbuild/src/consumer/kernel/kthread.c:313) [ 65.052205] ? process_one_work (kbuild/src/consumer/kernel/workqueue.c:2364) [ 65.052205] ? kthread_create_worker_on_cpu (kbuild/src/consumer/kernel/kthread.c:266) [ 65.052205] ? ret_from_fork (kbuild/src/consumer/arch/x86/entry/entry_32.S:775) [ 65.066846] loop: module loaded [ 65.078122] null_blk: module loaded [ 65.078673] Silicon Labs C2 port support v. 0.51.0 - (C) 2007 Rodolfo Giometti [ 65.079489] c2port c2port0: C2 port uc added [ 65.079958] c2port c2port0: uc flash has 30 blocks x 512 bytes (15360 bytes total) [ 65.081010] usbcore: registered new interface driver rtsx_usb [ 65.082303] usbcore: registered new interface driver pn533_usb [ 65.082978] usbcore: registered new interface driver nfcmrvl [ 65.083597] NCI uart driver 'nfcmrvl_uart [0]' registered [ 65.084302] Uniform Multi-Platform E-IDE driver [ 65.085233] ide_generic: please use "probe_mask=0x3f" module parameter for probing all legacy ISA IDE ports [ 65.086270] ide-cd driver 5.00 [ 65.087896] SSFDC read-only Flash Translation layer [ 65.088484] mtdoops: mtd device (mtddev=name/number) must be supplied [ 65.089317] platform physmap-flash.0: failed to claim resource 0: [mem 0x08000000-0x07ffffff] [ 65.090255] SBC-GXx flash: IO:0x258-0x259 MEM:0xdc000-0xdffff [ 65.090961] slram: not enough parameters. [ 65.091621] Driver 'dfl-spi-altera' was unable to register with bus_type 'dfl' because the bus was not initialized. [ 65.095780] wireguard: allowedips self-tests: pass [ 65.113505] wireguard: nonce counter self-tests: pass [ 65.691142] wireguard: ratelimiter self-tests: pass [ 65.691780] wireguard: WireGuard 1.0.0 loaded. See www.wireguard.com for information. [ 65.692614] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason(a)zx2c4.com&gt;. All Rights Reserved. [ 65.693599] eql: Equalizer2002: Simon Janes (simon(a)ncm.com) and David S. Miller (davem(a)redhat.com) [ 65.694895] MACsec IEEE 802.1AE [ 65.696576] libphy: Fixed MDIO Bus: probed [ 65.698059] usbcore: registered new interface driver mvusb_mdio [ 65.698765] tun: Universal TUN/TAP device driver, 1.6 [ 65.699721] e1000: Intel(R) PRO/1000 Network Driver [ 65.700291] e1000: Copyright (c) 1999-2006 Intel Corporation. [ 65.870690] ACPI: _SB_.LNKC: Enabled at IRQ 11 [ 66.238500] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56 [ 66.239265] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection [ 66.240099] mkiss: AX.25 Multikiss, Hans Albas PE1AYX [ 66.240719] AX.25: 6pack driver, Revision: 0.3.0 [ 66.241245] AX.25: bpqether driver version 004 [ 66.241704] baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA [ 66.241704] baycom_ser_fdx: version 0.10 [ 66.243814] hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA [ 66.244511] hdlcdrv: version 0.8 [ 66.244882] baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA [ 66.244882] baycom_ser_hdx: version 0.10 [ 66.246962] baycom_par: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA [ 66.246962] baycom_par: version 0.9 [ 66.249490] PPP generic driver version 2.4.2 [ 66.250116] PPP BSD Compression module registered [ 66.250727] PPP MPPE Compression module registered [ 66.251273] hdlc: HDLC support module revision 1.22 [ 66.251874] airo(): Probing for PCI adapters [ 66.252564] airo(): Finished probing for PCI adapters [ 66.253144] usbcore: registered new interface driver usb8xxx [ 66.253752] libertas_spi: Libertas SPI driver [ 66.254320] usbcore: registered new interface driver zd1201 [ 66.255021] usbcore: registered new interface driver rndis_wlan [ 66.255744] usbcore: registered new interface driver kaweth [ 66.256395] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver [ 66.257252] usbcore: registered new interface driver pegasus [ 66.257925] usbcore: registered new interface driver rtl8150 [ 66.258615] usbcore: registered new interface driver r8152 [ 66.259237] hso: drivers/net/usb/hso.c: Option Wireless [ 66.259929] usbcore: registered new interface driver hso [ 66.260559] usbcore: registered new interface driver cdc_ether [ 66.261214] usbcore: registered new interface driver cdc_eem [ 66.261836] usbcore: registered new interface driver dm9601 To reproduce: # build kernel cd linux cp config-5.13.0-rc3-00039-g8107f5f540ff .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang