Hello, Below issue was triggered in my test,it caused system panic ,please help check it. branch: for-6.4/block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git mdadm -CR /dev/md0 -l 1 -n 2 /dev/sda /dev/sdb -e 1.0 sgdisk -n 0:0:+100MiB /dev/md0 cat /proc/partitions mdadm -S /dev/md0 mdadm -A /dev/md0 /dev/sda /dev/sdb cat /proc/partitions [ 34.219123] BUG: kernel NULL pointer dereference, address: 00000000000000fc [ 34.219507] #PF: supervisor read access in kernel mode [ 34.219784] #PF: error_code(0x0000) - not-present page [ 34.220039] PGD 0 P4D 0 [ 34.220176] Oops: 0000 [#1] PREEMPT SMP PTI [ 34.220374] CPU: 8 PID: 1956 Comm: systemd-udevd Kdump: loaded Not tainted 6.3.0-rc2+ #1 [ 34.220787] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 05/21/2018 [ 34.221188] RIP: 0010:blk_mq_sched_bio_merge+0x6d/0xf0 [ 34.221491] Code: 55 10 89 c0 49 8b 6c 24 38 48 03 2c c5 00 4b c4 8f b8 02 00 00 00 f7 c2 00 00 80 00 75 07 31 c0 84 d2 0f 94 c0 48 8b 54 c5 50 <0f> b7 82 fc 00 00 00 f6 82 a8 00 00 00 01 74 53 48 c1 e0 04 4c 8d [ 34.222801] RSP: 0018:ffffbf5542f8f960 EFLAGS: 00010246 [ 34.223076] RAX: 0000000000000001 RBX: ffff9ac4a2a7be70 RCX: 0000000000004000 [ 34.223799] RDX: 0000000000000000 RSI: ffff9ac4a03b4d80 RDI: ffff9ac4a2a7be70 [ 34.224538] RBP: ffff9ac7efc00000 R08: 0000000000001000 R09: ffff9ac4830a6cd0 [ 34.225306] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9ac4a2a7be70 [ 34.226477] R13: ffff9ac4a03b4d80 R14: 0000000000000001 R15: 00000000000063f0 [ 34.227244] FS: 00007f9266a35540(0000) GS:ffff9ac7efc00000(0000) knlGS:0000000000000000 [ 34.227695] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.228396] CR2: 00000000000000fc CR3: 0000000117e8a004 CR4: 00000000001706e0 [ 34.229173] Call Trace: [ 34.229330] <TASK> [ 34.229824] blk_mq_submit_bio+0xdd/0x460 [ 34.230034] submit_bio_noacct_nocheck+0x124/0x1f0 [ 34.230667] mpage_readahead+0xe4/0x120 [ 34.230885] ? __pfx_blkdev_get_block+0x10/0x10 [ 34.231503] read_pages+0x5b/0x220 [ 34.232073] page_cache_ra_unbounded+0x137/0x180 [ 34.232702] force_page_cache_ra+0xc5/0xf0 [ 34.232918] filemap_get_pages+0xf9/0x360 [ 34.233124] ? path_init+0x3b6/0x400 [ 34.233328] filemap_read+0xc5/0x320 [ 34.233603] ? filename_lookup+0xcf/0x1d0 [ 34.233806] ? avc_has_perm+0x48/0xd0 [ 34.261+0xaf/0x170 [ 34.334144] vfs_read+0x204/0x2d0 [ 34.334715] ksys_read+0x5f/0xe0 [ 34.335281] do_syscall_64+0x5c/0x90 [ 34.335528] ? blkdev_llseek+0x4c/0x60 [ 34.335757] ? syscall_exit_work+0x103/0x130 [ 34.336467] ? syscall_exit_to_user_mode+0x12/0x30 [ 34.337118] ? do_syscall_64+0x69/0x90 [ 34.337326] entry_SYSCALL_64_after_hwframe+0x72/0xdc [ 34.337589] RIP: 0033:0x7f9266d3eaf2 [ 34.337795] Code: c0 e9 b2 fe ff ff 50 48 8d 3d ca 0c 08 00 e8 65 ea 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24 [ 34.339088] RSP: 002b:00007fff48f06508 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 34.339875] RAX: ffffffffffffffda RBX: 00005614ca035af8 RCX: 00007f9266d3eaf2 [ 34.340619] RDX: 0000000000000040 RSI: 00005614ca035b08 RDI: 000000000000000d [ 34.341355] RBP: 00005614c9fae4d0 R08: 0000000000000000 R09: 0000000000000000 [ 34.342129] R10: 0000000000000008 R11: 0000000000000246 R12: 000000000solver nfs lockd grace fscache netfs rfkill sunrpc intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp vfat kvm_intel fat kvm irqbypass ipmi_ssif iTCO_wdt iTCO_vendor_support mgag200 rapl i2c_algo_bit intel_cstate drm_shmem_helper i2c_i801 intel_uncore pcspkr drm_kms_helper i2c_smbus syscopyarea sysfillrect lpc_ich sysimgblt hpilo acpi_ipmi ioatdma dca ipmi_si ipmi_devintf ipmi_msghandler acpi_tad acpi_power_meter drm fuse xfs libcrc32c sd_mod sg crct10dif_pclmul ahci crc32_pclmul nvme libahci crc32c_intel ghash_clmulni_intel libata nvme_core tg3 hpwdt nvme_common hpsa t10_pi wmi scsi_transport_sas dm_mirror dm_region_hash dm_log dm_mod [ 34.846155] CR2: 00000000000000fc -- Best Regards, Changhui Zhong
