While running kselftest zram test cases on Linux next-20220324 the kernel BUG reported on arm64 Qcom db845 development board.

metadata: git_ref: master git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next git_sha: b61581ae229d8eb9f21f8753be3f4011f7692384 git_describe: next-20220323 kernel_version: 5.17.0 kernel-config: https://builds.tuxbuild.com/26mKdspULB326eo6s22cXZzYhmt/config

Log: [ 0.000000] Linux version 5.17.0-next-20220323 (tuxmake@tuxmake) (aarch64-linux-gnu-gcc (Debian 11.2.0-18) 11.2.0, GNU ld (GNU Binutils for Debian) 2.38) #1 SMP PREEMPT @1648023452 [ 0.000000] Machine model: Thundercomm Dragonboard 845c

# running zram tests # -------------------- # create '1' zram device(s) # zram load module successful # set max_comp_streams to zram device(s) # FAIL can't set max_streams '2', get # /sys/block/zram0/max_comp_streams = '8' (1/1) # z[ 626.759707] zram0: detected capacity change from 0 to 4096 ram max streams: OK # test that we can set compression algorithm # supported algs: lzo [lzo-rle] lz4 lz4hc 842 # /sys/block/zram0/comp_algorithm = 'lzo' (1/1) # zram set compression algorithm: OK # set disk size to zram device(s) # /sys/block/zram0/disksize = '2097152' (1/1) # zram set disksizes: OK # set memory limit to zram device(s) # /sys/block/zram0/mem_limit = '2M' (1/1) # zram set memory limit: OK # make ext4 filesystem on /dev/zram0 # zram mkfs.ext4: OK # mount /dev/zram0 [ 626.812708] EXT4-fs (zram0): mounted filesystem without journal. Quota mode: none. [ 626.820412] ext4 filesystem being mounted at /opt/kselftests/default-in-kernel/zram/zram0 supports timestamps until 2038 (0x7fffffff) # zram mount of zram device(s): OK # fill zram0... # zram0 can be filled with '1932' KB # zram used 12M, zram disk sizes 2097152M # zram compression ratio: 174762.66:1: OK # zram cleanup [ 636.589363] zram0: detected capacity change from 4096 to 0 # zram rmmod zram [ 636.607315] zram: Removed device: zram0 [ 636.682510] BUG: sleeping function called from invalid context at block/blk-sysfs.c:766 [ 636.690716] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/0 [ 636.698836] preempt_count: 101, expected: 0 [ 636.703169] RCU nest depth: 0, expected: 0 [ 636.707410] INFO: lockdep is turned off. [ 636.711471] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-next-20220323 #1 [ 636.718729] Hardware name: Thundercomm Dragonboard 845c (DT) [ 636.724485] Call trace: [ 636.726988] dump_backtrace+0xc0/0x134 [ 636.730823] show_stack+0x24/0x7c [ 636.734210] dump_stack_lvl+0x8c/0xb8 [ 636.737949] dump_stack+0x18/0x34 [ 636.741333] __might_resched+0x1c8/0x240 [ 636.745334] __might_sleep+0x5c/0x94 [ 636.748981] blk_release_queue+0x38/0x100 [ 636.753070] kobject_put+0xa4/0x210 [ 636.756631] blk_put_queue+0x20/0x30 [ 636.760278] blkg_free.part.0+0x68/0xa0 [ 636.764191] __blkg_release+0x50/0x74 [ 636.767926] rcu_core+0x410/0xb90 [ 636.771316] rcu_core_si+0x1c/0x2c [ 636.774789] __do_softirq+0x14c/0x654 [ 636.778522] __irq_exit_rcu+0x17c/0x1b0 [ 636.782436] irq_exit_rcu+0x1c/0x44 [ 636.785998] el1_interrupt+0x38/0x64 [ 636.789645] el1h_64_irq_handler+0x18/0x24 [ 636.793813] el1h_64_irq+0x64/0x68 [ 636.797284] cpuidle_enter_state+0xe4/0x380 [ 636.801544] cpuidle_enter+0x44/0x5c [ 636.805191] do_idle+0x240/0x2d0 [ 636.808484] cpu_startup_entry+0x34/0x3c [ 636.812479] rest_init+0x1c8/0x2d0 [ 636.815951] arch_call_rest_init+0x1c/0x28 [ 636.820126] start_kernel+0x73c/0x77c [ 636.823861] __primary_switched+0xc0/0xc8 # zram01 : [PASS] # # create '1' zram device(s) [ 636.859790] zram: Added device: zram0 # zram load module successful # set max_comp_streams to zram device(s) # FAIL can't set max_streams '2', get # /sys/block/zram0/max_comp_streams = '[ 637.901396] zram0: detected capacity change from 0 to 2048 8' (1/1) # zram max streams: OK # set disk size to zram device(s) # /sys/block/zram0/disksize = '1048576' (1/1) # zram set disksizes: OK # set memory limit to zram device(s) # /sys/block/zram0/mem_limit = '1M' (1/1) # zram set memory limit: OK # make swap with zram device(s) [ 637.935258] Adding 1020k swap on /dev/zram0. Priority:-2 extents:1 across:1020k SS # done with /dev/zram0 # zram making zram mkswap and swapon: OK # zram swapoff: OK # zram cleanup [ 637.995603] zram0: detected capacity change from 2048 to 0 # zram rmmod zram [ 638.012764] zram: Removed device: zram0 [ 638.110836] BUG: sleeping function called from invalid context at block/blk-sysfs.c:766 [ 638.118965] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/7 [ 638.126928] preempt_count: 101, expected: 0 [ 638.131179] RCU nest depth: 0, expected: 0 [ 638.135349] INFO: lockdep is turned off. [ 638.139350] CPU: 7 PID: 0 Comm: swapper/7 Tainted: G W 5.17.0-next-20220323 #1 [ 638.147964] Hardware name: Thundercomm Dragonboard 845c (DT) [ 638.153687] Call trace: [ 638.156170] dump_backtrace+0xc0/0x134 [ 638.159977] show_stack+0x24/0x7c [ 638.163332] dump_stack_lvl+0x8c/0xb8 [ 638.167049] dump_stack+0x18/0x34 [ 638.170408] __might_resched+0x1c8/0x240 [ 638.174387] __might_sleep+0x5c/0x94 [ 638.178004] blk_release_queue+0x38/0x100 [ 638.182071] kobject_put+0xa4/0x210 [ 638.185599] blk_put_queue+0x20/0x30 [ 638.189216] blkg_free.part.0+0x68/0xa0 [ 638.193106] __blkg_release+0x50/0x74 [ 638.196811] rcu_core+0x410/0xb90 [ 638.200168] rcu_core_si+0x1c/0x2c [ 638.203612] __do_softirq+0x14c/0x654 [ 638.207314] __irq_exit_rcu+0x17c/0x1b0 [ 638.211196] irq_exit_rcu+0x1c/0x44 [ 638.214727] el1_interrupt+0x38/0x64 [ 638.218346] el1h_64_irq_handler+0x18/0x24 [ 638.222493] el1h_64_irq+0x64/0x68 [ 638.225934] cpuidle_enter_state+0xe4/0x380 [ 638.230170] cpuidle_enter+0x44/0x5c [ 638.233787] do_idle+0x240/0x2d0 [ 638.237060] cpu_startup_entry+0x34/0x3c [ 638.241034] secondary_start_kernel+0x148/0x170 [ 638.245616] __secondary_switched+0xa0/0xa4 # zram02 : [PASS]

steps to produce: # cd /opt/kselftests/default-in-kernel/zram/ # ./zram.sh

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

-- Linaro LKFT https://lkft.linaro.org

[1] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20220323/tes... [2] https://lkft.validation.linaro.org/scheduler/job/4772266#L5186