gfs2: fsid=syz:syz.s: H: s:SH f:H e:0 p:5990 [syz.2.350] __gfs2_lookup+0xa9/0x290 fs/gfs2/inode.c:871 general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 6028 Comm: syz.2.350 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:pid_is_meaningful fs/gfs2/glock.c:1471 [inline] RIP: 0010:dump_holder fs/gfs2/glock.c:2331 [inline] RIP: 0010:gfs2_dump_glock+0xe9d/0x1b10 fs/gfs2/glock.c:2445 Code: c7 c2 00 25 d2 8a e8 32 2f d1 fd ba 20 00 00 00 48 8d bc 24 c0 00 00 00 31 f6 e8 be 9c 3f fe 4d 8d 7d 20 4d 89 fc 49 c1 ec 03 <41> 0f b6 04 1c 84 c0 0f 85 99 06 00 00 41 0f b7 1f 89 de 81 e6 00 RSP: 0018:ffffc9000c646ae0 EFLAGS: 00010202 RAX: ffffc9000c646ba0 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000020 RSI: 0000000000000000 RDI: ffffc9000c646bc0 RBP: ffffc9000c646dd0 R08: ffffc9000c646bbf R09: ffffc9000c646ba0 R10: dffffc0000000000 R11: fffff520018c8d78 R12: 0000000000000004 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000020 FS: 00007fede07d56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f204415ad10 CR3: 000000005485d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gfs2_consist_inode_i+0xf1/0x110 fs/gfs2/util.c:467 gfs2_dirent_scan+0x525/0x650 fs/gfs2/dir.c:602 gfs2_dirent_search+0x2e9/0x7f0 fs/gfs2/dir.c:850 gfs2_dir_search+0x49/0x220 fs/gfs2/dir.c:1650 gfs2_lookupi+0x487/0x680 fs/gfs2/inode.c:323 __gfs2_lookup+0xa9/0x290 fs/gfs2/inode.c:871 __lookup_slow+0x29d/0x3f0 fs/namei.c:1698 lookup_slow+0x53/0x70 fs/namei.c:1715 walk_component+0x2be/0x3f0 fs/namei.c:2006 lookup_last fs/namei.c:2463 [inline] path_lookupat+0x169/0x440 fs/namei.c:2487 filename_lookup+0x224/0x560 fs/namei.c:2516 kern_path+0x31/0x50 fs/namei.c:2614 unix_find_bsd net/unix/af_unix.c:1047 [inline] unix_find_other+0x102/0x800 net/unix/af_unix.c:1108 unix_dgram_sendmsg+0x8f2/0x16e0 net/unix/af_unix.c:1970 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmmsg+0x2c3/0x510 net/socket.c:2658 __do_sys_sendmmsg net/socket.c:2687 [inline] __se_sys_sendmmsg net/socket.c:2684 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2684 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fede259acb9 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:00007fede07d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fede2816090 RCX: 00007fede259acb9 RDX: 0000000000000001 RSI: 0000200000005a40 RDI: 0000000000000006 RBP: 00007fede2608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fede2816128 R14: 00007fede2816090 R15: 00007fff89e4c398 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pid_is_meaningful fs/gfs2/glock.c:1471 [inline] RIP: 0010:dump_holder fs/gfs2/glock.c:2331 [inline] RIP: 0010:gfs2_dump_glock+0xe9d/0x1b10 fs/gfs2/glock.c:2445 Code: c7 c2 00 25 d2 8a e8 32 2f d1 fd ba 20 00 00 00 48 8d bc 24 c0 00 00 00 31 f6 e8 be 9c 3f fe 4d 8d 7d 20 4d 89 fc 49 c1 ec 03 <41> 0f b6 04 1c 84 c0 0f 85 99 06 00 00 41 0f b7 1f 89 de 81 e6 00 RSP: 0018:ffffc9000c646ae0 EFLAGS: 00010202 RAX: ffffc9000c646ba0 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000020 RSI: 0000000000000000 RDI: ffffc9000c646bc0 RBP: ffffc9000c646dd0 R08: ffffc9000c646bbf R09: ffffc9000c646ba0 R10: dffffc0000000000 R11: fffff520018c8d78 R12: 0000000000000004 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000020 FS: 00007fede07d56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2bf0795e9c CR3: 000000005485d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c7 c2 00 25 d2 8a mov $0x8ad22500,%edx 6: e8 32 2f d1 fd call 0xfdd12f3d b: ba 20 00 00 00 mov $0x20,%edx 10: 48 8d bc 24 c0 00 00 lea 0xc0(%rsp),%rdi 17: 00 18: 31 f6 xor %esi,%esi 1a: e8 be 9c 3f fe call 0xfe3f9cdd 1f: 4d 8d 7d 20 lea 0x20(%r13),%r15 23: 4d 89 fc mov %r15,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 41 0f b6 04 1c movzbl (%r12,%rbx,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 99 06 00 00 jne 0x6d0 37: 41 0f b7 1f movzwl (%r15),%ebx 3b: 89 de mov %ebx,%esi 3d: 81 .byte 0x81 3e: e6 00 out %al,$0x0