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Message-ID: <kmyqlf2v5gvp5d2z35bkesks47kwik66tpufnna2ssykrolcos@kv3bmxh2lxfh> Date: Fri, 12 Apr 2024 15:21:14 +0200 From: Carlos Maiolino <cem@...nel.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: syzbot <syzbot+05e63c0981a31f35f3fa@...kaller.appspotmail.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, syzkaller-bugs@...glegroups.com, Christian Brauner <brauner@...nel.org> Subject: Re: [syzbot] [mm?] general protection fault in shmem_get_next_id On Wed, Apr 03, 2024 at 06:33:39PM -0700, Andrew Morton wrote: > On Mon, 01 Apr 2024 23:58:20 -0700 syzbot <syzbot+05e63c0981a31f35f3fa@...kaller.appspotmail.com> wrote: > > > Hello, > > Hello. > > Seems that the new TMPFS_QUOTA code has blown up. Cc's added, thanks > for the report and the reproducer! This seem to just have been hit the same race I fixed before, the HEAD commit described here didn't have the fix applied yet, I'll try to reproduce it locally just to confirm. Carlos > > > syzbot found the following issue on: > > > > HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel.. > > git tree: upstream > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c90795180000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=fe78468a74fdc3b7 > > dashboard link: https://syzkaller.appspot.com/bug?extid=05e63c0981a31f35f3fa > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f51129180000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=150d3cee180000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/0f7abe4afac7/disk-fe46a7dd.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/82598d09246c/vmlinux-fe46a7dd.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/efa23788c875/bzImage-fe46a7dd.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+05e63c0981a31f35f3fa@...kaller.appspotmail.com > > > > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI > > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > > CPU: 0 PID: 5070 Comm: syz-executor253 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > > RIP: 0010:shmem_get_next_id+0x92/0x5c0 mm/shmem_quota.c:119 > > Code: 04 db 49 8d 9c c6 90 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f8 66 1b 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 df 66 1b 00 4c 8b 23 48 8d 5d 07 > > RSP: 0018:ffffc900043a7be0 EFLAGS: 00010256 > > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880266c8000 > > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 > > RBP: ffffc900043a7d00 R08: ffffffff81dcdd47 R09: ffffffff822e7d5a > > R10: 0000000000000003 R11: ffffffff81dcdcf0 R12: 1ffff92000874fa0 > > R13: ffff888022110000 R14: ffff888022110000 R15: dffffc0000000000 > > FS: 0000555578677380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000020001000 CR3: 000000007a384000 CR4: 0000000000350ef0 > > Call Trace: > > <TASK> > > dquot_get_next_dqblk+0x75/0x3a0 fs/quota/dquot.c:2705 > > quota_getnextquota+0x2c7/0x6c0 fs/quota/quota.c:250 > > __do_sys_quotactl_fd fs/quota/quota.c:1002 [inline] > > __se_sys_quotactl_fd+0x2a1/0x440 fs/quota/quota.c:973 > > do_syscall_64+0xfd/0x240 > > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > > RIP: 0033:0x7f5c0349b329 > > Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007ffc39d71138 EFLAGS: 00000246 ORIG_RAX: 00000000000001bb > > RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f5c0349b329 > > RDX: 0000000000000000 RSI: ffffffff80000901 RDI: 0000000000000003 > > RBP: 00007f5c0350e610 R08: 0000000000000000 R09: 00007ffc39d71308 > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 > > R13: 00007ffc39d712f8 R14: 0000000000000001 R15: 0000000000000001 > > </TASK> > > Modules linked in: > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:shmem_get_next_id+0x92/0x5c0 mm/shmem_quota.c:119 > > Code: 04 db 49 8d 9c c6 90 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f8 66 1b 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 df 66 1b 00 4c 8b 23 48 8d 5d 07 > > RSP: 0018:ffffc900043a7be0 EFLAGS: 00010256 > > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880266c8000 > > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 > > RBP: ffffc900043a7d00 R08: ffffffff81dcdd47 R09: ffffffff822e7d5a > > R10: 0000000000000003 R11: ffffffff81dcdcf0 R12: 1ffff92000874fa0 > > R13: ffff888022110000 R14: ffff888022110000 R15: dffffc0000000000 > > FS: 0000555578677380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000020001000 CR3: 000000007a384000 CR4: 0000000000350ef0 > > ---------------- > > Code disassembly (best guess): > > 0: 04 db add $0xdb,%al > > 2: 49 8d 9c c6 90 02 00 lea 0x290(%r14,%rax,8),%rbx > > 9: 00 > > a: 48 89 d8 mov %rbx,%rax > > d: 48 c1 e8 03 shr $0x3,%rax > > 11: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) > > 16: 74 08 je 0x20 > > 18: 48 89 df mov %rbx,%rdi > > 1b: e8 f8 66 1b 00 call 0x1b6718 > > 20: 48 8b 1b mov (%rbx),%rbx > > 23: 48 89 d8 mov %rbx,%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: 48 89 df mov %rbx,%rdi > > 34: e8 df 66 1b 00 call 0x1b6718 > > 39: 4c 8b 23 mov (%rbx),%r12 > > 3c: 48 8d 5d 07 lea 0x7(%rbp),%rbx > > > > > > --- > > 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
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