Hello, syzbot found the following issue on: HEAD commit: f8f60f322f06 Add linux-next specific files for 20221111 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f0f3fe880000 kernel config: https://syzkaller.appspot.com/x/.config?x=85ba52c07cd97289 dashboard link: https://syzkaller.appspot.com/bug?extid=62ed954113bf02c79f74 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171f6c49880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16fdfd99880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6008df424195/disk-f8f60f32.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/394340525f66/vmlinux-f8f60f32.xz kernel image: https://storage.googleapis.com/syzbot-assets/b13604a3343a/bzImage-f8f60f32.xz The issue was bisected to: commit 2220e3a8953e86b87adfc753fc57c2a5e0b0a032 Author: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> Date: Mon Nov 7 18:47:15 2022 +0000 mm: anonymous shared memory naming bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d32f66880000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15d32f66880000 console output: https://syzkaller.appspot.com/x/log.txt?x=11d32f66880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+62ed954113bf02c79f74@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 2220e3a8953e ("mm: anonymous shared memory naming") ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5239 at include/linux/mmap_lock.h:155 mmap_assert_locked include/linux/mmap_lock.h:155 [inline] WARNING: CPU: 0 PID: 5239 at include/linux/mmap_lock.h:155 anon_vma_name+0x11c/0x170 mm/madvise.c:97 Modules linked in: CPU: 1 PID: 5239 Comm: syz-executor276 Not tainted 6.1.0-rc4-next-20221111-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:mmap_assert_locked include/linux/mmap_lock.h:155 [inline] RIP: 0010:anon_vma_name+0x11c/0x170 mm/madvise.c:97 Code: 8d bd 58 01 00 00 be ff ff ff ff e8 1e fc e0 07 31 ff 41 89 c4 89 c6 e8 c2 27 bc ff 45 85 e4 0f 85 5c ff ff ff e8 e4 2a bc ff <0f> 0b e9 50 ff ff ff e8 d8 2a bc ff 48 89 ef e8 00 e7 f2 ff 0f 0b RSP: 0018:ffffc90003c7f810 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffffff8b9ae000 RCX: 0000000000000000 RDX: ffff88801d5fba80 RSI: ffffffff81c0a28c RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8b9ae008 R14: ffffffff8b9ae010 R15: 0000000000000000 FS: 0000555556387300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000061ba0c CR3: 000000007d6c4000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> show_map_vma+0x22d/0x620 fs/proc/task_mmu.c:297 show_smap+0xe4/0x490 fs/proc/task_mmu.c:866 traverse.part.0+0xcf/0x5f0 fs/seq_file.c:111 traverse fs/seq_file.c:101 [inline] seq_read_iter+0x90f/0x1280 fs/seq_file.c:195 seq_read+0x16d/0x210 fs/seq_file.c:162 do_loop_readv_writev fs/read_write.c:756 [inline] do_loop_readv_writev fs/read_write.c:743 [inline] do_iter_read+0x4f8/0x750 fs/read_write.c:798 vfs_readv+0xe5/0x150 fs/read_write.c:916 do_preadv fs/read_write.c:1008 [inline] __do_sys_preadv fs/read_write.c:1058 [inline] __se_sys_preadv fs/read_write.c:1053 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1053 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f545e62b239 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffed9c02fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f545e62b239 RDX: 0000000000000001 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 00007ffed9c02ff0 R08: 0000000000000000 R09: 65732f636f72702f R10: 00000000fffffffe R11: 0000000000000246 R12: 00007f545e5ef120 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> --- 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@xxxxxxxxxxxxxxxx. 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 syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
