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Message-ID: <68c9c584.050a0220.2ff435.0433.GAE@google.com> Date: Tue, 16 Sep 2025 13:16:04 -0700 From: syzbot <syzbot+fa7122891ab9e0bbc6a7@...kaller.appspotmail.com> To: kriish.sharma2006@...il.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [gfs2?] general protection fault in gfs2_print_dbg (3) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in gfs2_print_dbg Oops: general protection fault, probably for non-canonical address 0xe7697c1115925d6c: 0000 [#1] SMP KASAN PTI KASAN: maybe wild-memory-access in range [0x3b4c0088ac92eb60-0x3b4c0088ac92eb67] CPU: 1 UID: 0 PID: 6617 Comm: syz.0.23 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:string_nocheck lib/vsprintf.c:653 [inline] RIP: 0010:string+0x1bb/0x2b0 lib/vsprintf.c:735 Code: 15 a5 f6 eb b3 41 c1 fd 10 4c 89 6c 24 10 49 8d 5d ff 45 31 ed 4b 8d 3c 2c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 60 4b 8d 2c 2e 47 0f b6 3c 2c 31 ff 44 89 fe RSP: 0018:ffffc900034b6f00 EFLAGS: 00010007 RAX: 0769801115925d6c RBX: 00000000fffffffe RCX: dffffc0000000000 RDX: ffff88802f929e40 RSI: 00000000ffff0a00 RDI: 3b4c0088ac92eb67 RBP: ffffffff8bf0acfe R08: ffff88802f929e40 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000000 R12: 3b4c0088ac92eb67 R13: 0000000000000000 R14: ffffc900034b7319 R15: 0000000000000030 FS: 00007fb88c0ac6c0(0000) GS:ffff888125ae8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa707863000 CR3: 000000005caf0000 CR4: 00000000003526f0 Call Trace: <TASK> vsnprintf+0x739/0xf00 lib/vsprintf.c:2926 va_format lib/vsprintf.c:1728 [inline] pointer+0x940/0x1190 lib/vsprintf.c:2548 vsnprintf+0x60f/0xf00 lib/vsprintf.c:2930 vprintk_store+0x3c7/0xd00 kernel/printk/printk.c:2252 vprintk_emit+0x15f/0x590 kernel/printk/printk.c:2399 _printk+0xcf/0x120 kernel/printk/printk.c:2448 gfs2_print_dbg+0x19a/0x1b0 fs/gfs2/glock.c:1444 dump_holder fs/gfs2/glock.c:2287 [inline] gfs2_dump_glock+0x152d/0x1bc0 fs/gfs2/glock.c:2398 gfs2_consist_inode_i+0xf5/0x110 fs/gfs2/util.c:446 gfs2_dirent_scan+0x545/0x690 fs/gfs2/dir.c:-1 gfs2_dir_read+0x804/0x16f0 fs/gfs2/dir.c:1600 gfs2_readdir+0x14c/0x1b0 fs/gfs2/file.c:116 iterate_dir+0x399/0x570 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb88b18eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb88c0ac038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fb88b3d6090 RCX: 00007fb88b18eba9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fb88b211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb88b3d6128 R14: 00007fb88b3d6090 R15: 00007ffde70dec98 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:string_nocheck lib/vsprintf.c:653 [inline] RIP: 0010:string+0x1bb/0x2b0 lib/vsprintf.c:735 Code: 15 a5 f6 eb b3 41 c1 fd 10 4c 89 6c 24 10 49 8d 5d ff 45 31 ed 4b 8d 3c 2c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 60 4b 8d 2c 2e 47 0f b6 3c 2c 31 ff 44 89 fe RSP: 0018:ffffc900034b6f00 EFLAGS: 00010007 RAX: 0769801115925d6c RBX: 00000000fffffffe RCX: dffffc0000000000 RDX: ffff88802f929e40 RSI: 00000000ffff0a00 RDI: 3b4c0088ac92eb67 RBP: ffffffff8bf0acfe R08: ffff88802f929e40 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000000 R12: 3b4c0088ac92eb67 R13: 0000000000000000 R14: ffffc900034b7319 R15: 0000000000000030 FS: 00007fb88c0ac6c0(0000) GS:ffff888125ae8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa707863000 CR3: 000000005caf0000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 15 a5 f6 eb b3 adc $0xb3ebf6a5,%eax 5: 41 c1 fd 10 sar $0x10,%r13d 9: 4c 89 6c 24 10 mov %r13,0x10(%rsp) e: 49 8d 5d ff lea -0x1(%r13),%rbx 12: 45 31 ed xor %r13d,%r13d 15: 4b 8d 3c 2c lea (%r12,%r13,1),%rdi 19: 48 89 f8 mov %rdi,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 75 60 jne 0x92 32: 4b 8d 2c 2e lea (%r14,%r13,1),%rbp 36: 47 0f b6 3c 2c movzbl (%r12,%r13,1),%r15d 3b: 31 ff xor %edi,%edi 3d: 44 89 fe mov %r15d,%esi Tested on: commit: 590b221e Add linux-next specific files for 20250912 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/ console output: https://syzkaller.appspot.com/x/log.txt?x=1205f762580000 kernel config: https://syzkaller.appspot.com/x/.config?x=12a1d1f3a8199632 dashboard link: https://syzkaller.appspot.com/bug?extid=fa7122891ab9e0bbc6a7 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.
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