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AFNElJ/xUiiENYD+it5B/XiXGddk5Qu2jAvIE7rakM6GwRF2pIh4fM4bg1705+4UqPtK+WyCAa4V@lists.linux.dev X-Gm-Message-State: AOJu0YzbLTQY8rQXHE0YrIgXreswBB6mCyO4NylHvQhrTqeQ1PZYBPyS RlJCpJVvNNCHjrY8Cj/jT1yAWFB73EH6zdgjw93b7kJu/TIOUkU0lshiBvhRXVV40Fe3CpOZyhC JKf7Q/hU80qsjzQAdkWWhmLhZEC9+lhzjo1h/yVNCfVimipSYqKRJa5jh0H4= Precedence: bulk X-Mailing-List: gfs2@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:3089:b0:489:f088:5f70 with SMTP id 5614622812f47-495eae01c05mr934536b6e.12.1782766100970; Mon, 29 Jun 2026 13:48:20 -0700 (PDT) Date: Mon, 29 Jun 2026 13:48:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a42da14.b42ede87.8e801.0000.GAE@google.com> Subject: [syzbot] [gfs2?] general protection fault in _find_first_zero_bit From: syzbot To: agruenba@redhat.com, gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 51cb1aa1250c Merge tag 'loongarch-7.2' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10748efa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=86ba763b42fa66a dashboard link: https://syzkaller.appspot.com/bug?extid=cb79de2cc8b76fbf474f compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b7c246580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1205b6b1580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/edf195a1627e/disk-51cb1aa1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e282a4f3a85b/vmlinux-51cb1aa1.xz kernel image: https://storage.googleapis.com/syzbot-assets/a485374265d8/bzImage-51cb1aa1.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/82f270d69c7c/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=17b48efa580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cb79de2cc8b76fbf474f@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5755 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:_find_first_zero_bit+0x29/0xb0 lib/find_bit.c:149 Code: 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 48 89 f3 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 b8 55 7c fd 49 8b 06 48 83 f8 ff RSP: 0018:ffffc9000365f6c0 EFLAGS: 00010256 RAX: 0000000000000000 RBX: 000000000000f800 RCX: 0000000000000000 RDX: ffff888034374c40 RSI: 000000000000f800 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006cbecc R12: ffff888058d1d3f0 R13: ffff888034374c38 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125223000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b8a06ea00 CR3: 000000000e746000 CR4: 0000000000350ef0 Call Trace: find_first_zero_bit include/linux/find.h:391 [inline] slot_get fs/gfs2/quota.c:355 [inline] qdsb_get+0x133/0x340 fs/gfs2/quota.c:522 gfs2_quota_hold+0x191/0x5c0 fs/gfs2/quota.c:606 gfs2_dinode_dealloc+0x176/0x3f0 fs/gfs2/inode.c:488 evict_unlinked_inode fs/gfs2/super.c:1329 [inline] gfs2_evict_inode+0x11cd/0x1400 fs/gfs2/super.c:1479 evict+0x624/0xb50 fs/inode.c:825 gfs2_put_super+0x300/0x860 fs/gfs2/super.c:618 generic_shutdown_super+0x13d/0x2d0 fs/super.c:647 kill_block_super+0x44/0x90 fs/super.c:1665 deactivate_locked_super+0xbc/0x130 fs/super.c:477 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:1004 do_group_exit+0x22d/0x2f0 kernel/exit.c:1147 __do_sys_exit_group kernel/exit.c:1158 [inline] __se_sys_exit_group kernel/exit.c:1156 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1156 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b89f9ce59 Code: Unable to access opcode bytes at 0x7f8b89f9ce2f. RSP: 002b:00007ffc5b7df378 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f8b8a03233c RCX: 00007f8b89f9ce59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000016 R08: 0000000000000000 R09: 00007f8b8a0322ca R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc5b7e0630 R13: 00007f8b8a0322ca R14: 0000555582f544e8 R15: 00007ffc5b7e49d0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:_find_first_zero_bit+0x29/0xb0 lib/find_bit.c:149 Code: 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 48 89 f3 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 b8 55 7c fd 49 8b 06 48 83 f8 ff RSP: 0018:ffffc9000365f6c0 EFLAGS: 00010256 RAX: 0000000000000000 RBX: 000000000000f800 RCX: 0000000000000000 RDX: ffff888034374c40 RSI: 000000000000f800 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006cbecc R12: ffff888058d1d3f0 R13: ffff888034374c38 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125223000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b8a06ea00 CR3: 000000000e746000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 41 57 push %r15 7: 41 56 push %r14 9: 41 55 push %r13 b: 41 54 push %r12 d: 53 push %rbx e: 48 85 f6 test %rsi,%rsi 11: 74 46 je 0x59 13: 48 89 f3 mov %rsi,%rbx 16: 49 89 fe mov %rdi,%r14 19: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 20: fc ff df 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 b8 55 7c fd call 0xfd7c55f1 39: 49 8b 06 mov (%r14),%rax 3c: 48 83 f8 ff cmp $0xffffffffffffffff,%rax --- 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