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smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f198.google.com with SMTP id 5614622812f47-54213290993so1897027b6e.0 for ; Thu, 29 Oct 2026 06:38:42 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793281121; x=1793885921; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=sDVeiRDeiSS1j+gt5p+yJjcaKxTQtcrhUFgeEvI6Upk=; b=iCteasd6qDszCPuvDSIufAX3gpxiY+kJhe/0wz42Xz1ytQ5aOXiBoMlT+SqGdN51d6 H4ajqszUoixORev7/nfprJhoRlwHjD2WE1yEJfBLt5Fx/UVLHFL7yYKW7ZxkQksJ6HPi PvhRfOVloZWPOeAJ4+QIltNN6yWjuRn/scAZB95gaqINvzOtz20S3unva5+uKdqvY9Tx cCFcgMVoLrvemCdRgS+/UcWCEza1C6e4aHppSdsnPvVbLRKydgIzmwB9bYL7BSPZ8reM 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Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 330517c63aa9 Merge tag 'char-misc-7.4-rc1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13561459580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b03c85f3988bfcd5 dashboard link: https://syzkaller.appspot.com/bug?extid=08318698e045b4b85f51 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1062d695580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15236fcd580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-330517c6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecb230491807/vmlinux-330517c6.xz kernel image: https://storage.googleapis.com/syzbot-assets/ace3132a7acc/bzImage-330517c6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+08318698e045b4b85f51@syzkaller.appspotmail.com md: array md0 already has disks! md/raid:md0: not clean -- starting background reconstruction raid456_cpu_up_prepare: failed memory allocation for cpu0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6024 Comm: syz.0.22 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__hlist_del include/linux/list.h:1045 [inline] RIP: 0010:hlist_del include/linux/list.h:1059 [inline] RIP: 0010:__cpuhp_state_remove_instance+0x227/0x5f0 kernel/cpu.c:2573 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 78 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 08 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 4c 03 00 00 49 89 1c 24 48 85 db 74 28 e8 51 1f RSP: 0018:ffffc90003c7f890 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81c9fb54 RDI: ffff8880287a8440 RBP: ffff8880287a8438 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000004 R15: 0000000000000003 FS: 00007fcd283f56c0(0000) GS:ffff8880d45b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30324228 CR3: 0000000037605000 CR4: 0000000000352ef0 Call Trace: cpuhp_state_remove_instance include/linux/cpuhotplug.h:480 [inline] raid5_free_percpu drivers/md/raid5.c:7541 [inline] free_conf+0x238/0x710 drivers/md/raid5.c:7554 setup_conf+0xd80/0x2a20 drivers/md/raid5.c:7885 raid5_run+0x1260/0x1670 drivers/md/raid5.c:8129 md_run+0xc2f/0x2510 drivers/md/md.c:6779 do_md_run+0x36/0x660 drivers/md/md.c:6880 md_ioctl+0x27e6/0x36c0 drivers/md/md.c:8515 blkdev_ioctl+0x5ad/0x6f0 block/ioctl.c:798 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd2759f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd283f5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcd27825fa0 RCX: 00007fcd2759f559 RDX: 0000000000000000 RSI: 00000000400c0930 RDI: 0000000000000003 RBP: 00007fcd27636b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd27826038 R14: 00007fcd27825fa0 R15: 00007ffd1d32f288 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:1045 [inline] RIP: 0010:hlist_del include/linux/list.h:1059 [inline] RIP: 0010:__cpuhp_state_remove_instance+0x227/0x5f0 kernel/cpu.c:2573 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 78 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 08 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 4c 03 00 00 49 89 1c 24 48 85 db 74 28 e8 51 1f RSP: 0018:ffffc90003c7f890 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81c9fb54 RDI: ffff8880287a8440 RBP: ffff8880287a8438 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000004 R15: 0000000000000003 FS: 00007fcd283f56c0(0000) GS:ffff8880d44b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcd283d3ff8 CR3: 0000000037605000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 fc add %bh,%ah 2: ff lcall (bad) 3: df 48 89 fisttps -0x77(%rax) 6: fa cli 7: 48 c1 ea 03 shr $0x3,%rdx b: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) f: 0f 85 78 03 00 00 jne 0x38d 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 4c 8b 65 08 mov 0x8(%rbp),%r12 23: 4c 89 e2 mov %r12,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 4c 03 00 00 jne 0x380 34: 49 89 1c 24 mov %rbx,(%r12) 38: 48 85 db test %rbx,%rbx 3b: 74 28 je 0x65 3d: e8 .byte 0xe8 3e: 51 push %rcx 3f: 1f (bad) --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup