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006d021491bc7-6b48043ec63mr234212eaf.32.1788303985978; Tue, 01 Sep 2026 16:06:25 -0700 (PDT) Date: Tue, 01 Sep 2026 16:06:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a975a71.9266084e.bf0d7.0002.GAE@google.com> Subject: [syzbot] [gfs2?] general protection fault in gfs2_quota_lock 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: 89c07d98716a Add linux-next specific files for 20260831 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13eafe25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3084bde934a7eb4b dashboard link: https://syzkaller.appspot.com/bug?extid=d84e35a320d14f8c270a 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=167d3b79580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c51379580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/efda3e96af9f/disk-89c07d98.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7cba3e147607/vmlinux-89c07d98.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf4b2e49d1cb/bzImage-89c07d98.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/85a2c905fb7a/mount_2.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=10c51379580000) The issue was bisected to: commit e65756f09826a87322479abc946ca11e6816a6ce Author: Andreas Gruenbacher Date: Wed Aug 26 10:41:28 2026 +0000 gfs2: No quotas for meta inodes bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=112f5c15580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=132f5c15580000 console output: https://syzkaller.appspot.com/x/log.txt?x=152f5c15580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d84e35a320d14f8c270a@syzkaller.appspotmail.com Fixes: e65756f09826 ("gfs2: No quotas for meta inodes") capability: warning: `syz-executor311' uses deprecated v2 capabilities in a way that may be insecure Oops: general protection fault, probably for non-canonical address 0xdffffc0000000020: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000100-0x0000000000000107] CPU: 1 UID: 0 PID: 5636 Comm: syz-executor311 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:gfs2_quota_lock+0x103/0x7b0 fs/gfs2/quota.c:1105 Code: 00 00 4d 89 fd 49 c1 ed 03 41 80 7c 1d 00 00 74 08 4c 89 ff e8 1e fd e7 fd 49 8b 3f 48 8d 87 00 01 00 00 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 0f 85 c9 05 00 00 8b b7 00 01 00 00 ba 08 00 00 RSP: 0018:ffffc90003bcf8d0 EFLAGS: 00010202 RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000020 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff907a487f R09: 1ffffffff20f490f R10: dffffc0000000000 R11: fffffbfff20f4910 R12: ffff888012189320 R13: 1ffff110024312f9 R14: 00000000ffffffff R15: ffff8880121897c8 FS: 000055558edf6400(0000) GS:ffff888124dcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006a9ee0 CR3: 0000000073f60000 CR4: 00000000003526f0 Call Trace: gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] do_grow fs/gfs2/bmap.c:2117 [inline] gfs2_setattr_size+0x9df/0x1270 fs/gfs2/bmap.c:2198 gfs2_setattr+0x269/0x430 fs/gfs2/inode.c:2138 notify_change+0xbba/0xea0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 ksys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f49688f2409 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd4cc3da68 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f49688f2409 RDX: 00007f49688f2409 RSI: 000000000008fff5 RDI: 0000200000000180 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd4cc3db98 R13: 0000000000000002 R14: 00007f49689b3c80 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:gfs2_quota_lock+0x103/0x7b0 fs/gfs2/quota.c:1105 Code: 00 00 4d 89 fd 49 c1 ed 03 41 80 7c 1d 00 00 74 08 4c 89 ff e8 1e fd e7 fd 49 8b 3f 48 8d 87 00 01 00 00 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 0f 85 c9 05 00 00 8b b7 00 01 00 00 ba 08 00 00 RSP: 0018:ffffc90003bcf8d0 EFLAGS: 00010202 RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000020 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff907a487f R09: 1ffffffff20f490f R10: dffffc0000000000 R11: fffffbfff20f4910 R12: ffff888012189320 R13: 1ffff110024312f9 R14: 00000000ffffffff R15: ffff8880121897c8 FS: 000055558edf6400(0000) GS:ffff888124dcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006a9ee0 CR3: 0000000073f60000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4d 89 fd mov %r15,%r13 5: 49 c1 ed 03 shr $0x3,%r13 9: 41 80 7c 1d 00 00 cmpb $0x0,0x0(%r13,%rbx,1) f: 74 08 je 0x19 11: 4c 89 ff mov %r15,%rdi 14: e8 1e fd e7 fd call 0xfde7fd37 19: 49 8b 3f mov (%r15),%rdi 1c: 48 8d 87 00 01 00 00 lea 0x100(%rdi),%rax 23: 48 89 c1 mov %rax,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx <-- trapping instruction 2e: 84 c9 test %cl,%cl 30: 0f 85 c9 05 00 00 jne 0x5ff 36: 8b b7 00 01 00 00 mov 0x100(%rdi),%esi 3c: ba .byte 0xba 3d: 08 00 or %al,(%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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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