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X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR11MB5324 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 00ff643264f9f5c300898a591fa4b83a62c43950 ("[PATCH] block: prevent deadlock in del_gendisk()") url: https://github.com/intel-lab-lkp/linux/commits/Ujwal-Kundur/block-prevent-deadlock-in-del_gendisk/20250803-214237 base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git for-next patch link: https://lore.kernel.org/all/20250803134114.2707-1-ujwal.kundur@gmail.com/ patch subject: [PATCH] block: prevent deadlock in del_gendisk() in testcase: phoronix-test-suite version: with following parameters: test: svt-av1-2.11.1 option_a: 2 option_b: Bosphorus 1080p cpufreq_governor: performance config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz (Cascade Lake) with 512G memory (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202508081000.cb134e91-lkp@intel.com [ 24.331036][ T1884] BUG: kernel NULL pointer dereference, address: 00000000000000a8 [ 24.339231][ T1884] #PF: supervisor write access in kernel mode [ 24.345493][ T1884] #PF: error_code(0x0002) - not-present page [ 24.351631][ T1884] PGD 0 P4D 0 [ 24.355133][ T1884] Oops: Oops: 0002 [#1] SMP NOPTI [ 24.360264][ T1884] CPU: 26 UID: 0 PID: 1884 Comm: dockerd Tainted: G S 6.16.0-04436-g00ff643264f9 #1 VOLUNTARY [ 24.372434][ T1884] Tainted: [S]=CPU_OUT_OF_SPEC [ 24.377290][ T1884] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [ 24.388664][ T1884] RIP: 0010:down_read (arch/x86/include/asm/atomic64_64.h:79 include/linux/atomic/atomic-arch-fallback.h:2723 include/linux/atomic/atomic-long.h:163 include/linux/atomic/atomic-instrumented.h:3298 kernel/locking/rwsem.c:250 kernel/locking/rwsem.c:1245 kernel/locking/rwsem.c:1259 kernel/locking/rwsem.c:1524) [ 24.393632][ T1884] Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 53 48 89 fb e8 ae c0 ff ff be 00 01 00 00 48 0f c1 33 48 81 c6 00 01 00 00 78 3f 48 b8 07 00 00 00 00 00 All code ======== 0: 00 00 add %al,(%rax) 2: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax) 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: f3 0f 1e fa endbr64 17: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 1c: 53 push %rbx 1d: 48 89 fb mov %rdi,%rbx 20: e8 ae c0 ff ff call 0xffffffffffffc0d3 25: be 00 01 00 00 mov $0x100,%esi 2a:* f0 48 0f c1 33 lock xadd %rsi,(%rbx) <-- trapping instruction 2f: 48 81 c6 00 01 00 00 add $0x100,%rsi 36: 78 3f js 0x77 38: 48 rex.W 39: b8 07 00 00 00 mov $0x7,%eax ... Code starting with the faulting instruction =========================================== 0: f0 48 0f c1 33 lock xadd %rsi,(%rbx) 5: 48 81 c6 00 01 00 00 add $0x100,%rsi c: 78 3f js 0x4d e: 48 rex.W f: b8 07 00 00 00 mov $0x7,%eax ... [ 24.413635][ T1884] RSP: 0018:ffffc900211f3918 EFLAGS: 00010246 [ 24.419821][ T1884] RAX: 0000000000000000 RBX: 00000000000000a8 RCX: 00000000000001f0 [ 24.427912][ T1884] RDX: 00000000000001ef RSI: 0000000000000100 RDI: 00000000000000a8 [ 24.436003][ T1884] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 24.444092][ T1884] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000a8 [ 24.452181][ T1884] R13: ffff88c1841e87a0 R14: ffff88c08b28ad68 R15: ffff88c0ce5b2200 [ 24.460273][ T1884] FS: 00007ff8a3fff6c0(0000) GS:ffff88f027468000(0000) knlGS:0000000000000000 [ 24.469318][ T1884] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.476016][ T1884] CR2: 00000000000000a8 CR3: 000000010e760004 CR4: 00000000007726f0 [ 24.484104][ T1884] PKRU: 55555554 [ 24.487751][ T1884] Call Trace: [ 24.491131][ T1884] [ 24.494147][ T1884] __del_gendisk (block/genhd.c:745) [ 24.498810][ T1884] cleanup_mapped_device (drivers/md/dm.c:2243) dm_mod [ 24.504959][ T1884] __dm_destroy (include/linux/list.h:373 drivers/md/dm.c:2397 drivers/md/dm.c:2730) dm_mod [ 24.510321][ T1884] ? __pfx_dev_remove (drivers/md/dm-ioctl.c:978) dm_mod [ 24.516029][ T1884] dev_remove (drivers/md/dm-ioctl.c:1029) dm_mod [ 24.521215][ T1884] ctl_ioctl (drivers/md/dm-ioctl.c:2101) dm_mod [ 24.526310][ T1884] dm_ctl_ioctl (drivers/md/dm-ioctl.c:2123) dm_mod [ 24.531399][ T1884] __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:598 fs/ioctl.c:584 fs/ioctl.c:584) [ 24.536040][ T1884] ? change_protection_range (mm/mprotect.c:498 mm/mprotect.c:526) [ 24.541726][ T1884] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 24.546279][ T1884] ? get_page_from_freelist (mm/page_alloc.c:1083 mm/page_alloc.c:1702 mm/page_alloc.c:1712 mm/page_alloc.c:3669) [ 24.551869][ T1884] ? __alloc_frozen_pages_noprof (mm/page_alloc.c:4959) [ 24.557894][ T1884] ? mod_memcg_lruvec_state (mm/memcontrol.c:576 mm/memcontrol.c:564 mm/memcontrol.c:754) [ 24.563495][ T1884] ? __lruvec_stat_mod_folio (mm/memcontrol.c:800) [ 24.569006][ T1884] ? __folio_mod_stat (mm/rmap.c:1414) [ 24.573905][ T1884] ? folio_add_new_anon_rmap (arch/x86/include/asm/bitops.h:206 arch/x86/include/asm/bitops.h:238 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/page-flags.h:867 include/linux/page-flags.h:888 include/linux/mm.h:992 mm/rmap.c:1609) [ 24.579493][ T1884] ? do_anonymous_page (mm/memory.c:5153) [ 24.584646][ T1884] ? __handle_mm_fault (mm/memory.c:6230) [ 24.589805][ T1884] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 24.594520][ T1884] ? count_memcg_events (mm/memcontrol.c:576 mm/memcontrol.c:564 mm/memcontrol.c:848) [ 24.599749][ T1884] ? handle_mm_fault (include/linux/memcontrol.h:978 include/linux/memcontrol.h:985 mm/memory.c:6264 mm/memory.c:6425) [ 24.604635][ T1884] ? do_user_addr_fault (arch/x86/mm/fault.c:1337) [ 24.609863][ T1884] ? clear_bhb_loop (arch/x86/entry/entry_64.S:1548) [ 24.614572][ T1884] ? clear_bhb_loop (arch/x86/entry/entry_64.S:1548) [ 24.619279][ T1884] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 24.625200][ T1884] RIP: 0033:0x7ff9476c3d1b [ 24.629648][ T1884] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 All code ======== 0: 00 48 89 add %cl,-0x77(%rax) 3: 44 24 18 rex.R and $0x18,%al 6: 31 c0 xor %eax,%eax 8: 48 8d 44 24 60 lea 0x60(%rsp),%rax d: c7 04 24 10 00 00 00 movl $0x10,(%rsp) 14: 48 89 44 24 08 mov %rax,0x8(%rsp) 19: 48 8d 44 24 20 lea 0x20(%rsp),%rax 1e: 48 89 44 24 10 mov %rax,0x10(%rsp) 23: b8 10 00 00 00 mov $0x10,%eax 28: 0f 05 syscall 2a:* 89 c2 mov %eax,%edx <-- trapping instruction 2c: 3d 00 f0 ff ff cmp $0xfffff000,%eax 31: 77 1c ja 0x4f 33: 48 8b 44 24 18 mov 0x18(%rsp),%rax 38: 64 fs 39: 48 rex.W 3a: 2b .byte 0x2b 3b: 04 25 add $0x25,%al 3d: 28 00 sub %al,(%rax) ... Code starting with the faulting instruction =========================================== 0: 89 c2 mov %eax,%edx 2: 3d 00 f0 ff ff cmp $0xfffff000,%eax 7: 77 1c ja 0x25 9: 48 8b 44 24 18 mov 0x18(%rsp),%rax e: 64 fs f: 48 rex.W 10: 2b .byte 0x2b 11: 04 25 add $0x25,%al 13: 28 00 sub %al,(%rax) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250808/202508081000.cb134e91-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki