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Message-ID: <3a069431-dbc0-28c1-c7eb-6f376b38c866@huaweicloud.com> Date: Tue, 23 Sep 2025 14:35:45 +0800 From: Yu Kuai <yukuai1@...weicloud.com> To: Jens Axboe <axboe@...nel.dk>, syzbot <syzbot+5c5d41e80248d610221f@...kaller.appspotmail.com>, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, Ming Lei <ming.lei@...hat.com>, "yukuai (C)" <yukuai3@...wei.com> Subject: Re: [syzbot] [block?] general protection fault in blk_mq_free_tags_callback Hi, 在 2025/09/23 14:20, Jens Axboe 写道: > On 9/22/25 2:24 PM, syzbot wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 846bd2225ec3 Add linux-next specific files for 20250919 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=13c238e2580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=135377594f35b576 >> dashboard link: https://syzkaller.appspot.com/bug?extid=5c5d41e80248d610221f >> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155e427c580000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bb8142580000 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/c53d48022f8a/disk-846bd222.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/483534e784c8/vmlinux-846bd222.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/721b36eec9b3/bzImage-846bd222.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+5c5d41e80248d610221f@...kaller.appspotmail.com >> >> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI >> KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] >> CPU: 0 UID: 0 PID: 5962 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 >> Workqueue: rcu_gp srcu_invoke_callbacks >> RIP: 0010:__list_del_entry_valid_or_report+0x25/0x190 lib/list_debug.c:49 >> Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 89 fb 49 bd 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 af 58 47 fd 4c 8b 7b 08 48 89 d8 48 c1 e8 >> RSP: 0018:ffffc90003d2f8e8 EFLAGS: 00010202 >> RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88802f573c80 >> RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000008 >> RBP: dffffc0000000000 R08: ffffffff8fe4db77 R09: 1ffffffff1fc9b6e >> R10: dffffc0000000000 R11: ffffffff84b089f0 R12: 1ffff11004cb1e1f >> R13: dffffc0000000000 R14: ffff88802658f0a0 R15: 0000000000000000 >> FS: 0000000000000000(0000) GS:ffff8881257a2000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000055946acdc950 CR3: 000000007a708000 CR4: 00000000003526f0 >> Call Trace: >> <TASK> >> __list_del_entry_valid include/linux/list.h:132 [inline] >> __list_del_entry include/linux/list.h:223 [inline] >> list_del_init include/linux/list.h:295 [inline] >> blk_mq_free_tags_callback+0x5a/0x180 block/blk-mq-tag.c:593 >> srcu_invoke_callbacks+0x208/0x450 kernel/rcu/srcutree.c:1807 >> process_one_work kernel/workqueue.c:3263 [inline] >> process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 >> worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 >> kthread+0x711/0x8a0 kernel/kthread.c:463 >> ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 >> </TASK> >> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:__list_del_entry_valid_or_report+0x25/0x190 lib/list_debug.c:49 >> Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 89 fb 49 bd 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 af 58 47 fd 4c 8b 7b 08 48 89 d8 48 c1 e8 >> RSP: 0018:ffffc90003d2f8e8 EFLAGS: 00010202 >> RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88802f573c80 >> RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000008 >> RBP: dffffc0000000000 R08: ffffffff8fe4db77 R09: 1ffffffff1fc9b6e >> R10: dffffc0000000000 R11: ffffffff84b089f0 R12: 1ffff11004cb1e1f >> R13: dffffc0000000000 R14: ffff88802658f0a0 R15: 0000000000000000 >> FS: 0000000000000000(0000) GS:ffff8881257a2000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000055946acdc950 CR3: 000000007a708000 CR4: 00000000003526f0 >> ---------------- >> Code disassembly (best guess): >> 0: 90 nop >> 1: 90 nop >> 2: 90 nop >> 3: 90 nop >> 4: 90 nop >> 5: f3 0f 1e fa endbr64 >> 9: 41 57 push %r15 >> b: 41 56 push %r14 >> d: 41 55 push %r13 >> f: 41 54 push %r12 >> 11: 53 push %rbx >> 12: 48 89 fb mov %rdi,%rbx >> 15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 >> 1c: fc ff df >> 1f: 48 83 c7 08 add $0x8,%rdi >> 23: 48 89 f8 mov %rdi,%rax >> 26: 48 c1 e8 03 shr $0x3,%rax >> * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction >> 2f: 74 05 je 0x36 >> 31: e8 af 58 47 fd call 0xfd4758e5 >> 36: 4c 8b 7b 08 mov 0x8(%rbx),%r15 >> 3a: 48 89 d8 mov %rbx,%rax >> 3d: 48 rex.W >> 3e: c1 .byte 0xc1 >> 3f: e8 .byte 0xe8 >> >> >> --- >> 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@...glegroups.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 > > Adding Ming, looks related to the SRCU changes perhaps? > A quick look, yes it's related. Root cause is that blk_mq_free_tags() can be called after blk_mq_init_tags(), while tags->page_list is still not initialized by blk_mq_alloc_rqs(). Thanks, Kuai
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