On Fri, 13 May 2022 09:43:24 -0700 syzbot <syzbot+acf65ca584991f3cc447@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > syzbot has found a reproducer for the following issue on: Thanks. > HEAD commit: 1e1b28b936ae Add linux-next specific files for 20220513 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=174ae715f00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e4eb3c0c4b289571 > dashboard link: https://syzkaller.appspot.com/bug?extid=acf65ca584991f3cc447 > 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=11531766f00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ce5a9ef00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+acf65ca584991f3cc447@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 3611 at mm/hugetlb.c:6250 follow_hugetlb_page+0x1326/0x1c80 mm/hugetlb.c:6250 The try_grab_folio() added by 822951d84684d ("mm/hugetlb: Use try_grab_folio() instead of try_grab_compound_head()"). That commit has been there over a month so I guess it's something else. Does someone have the time to bisect? > Modules linked in: > CPU: 1 PID: 3611 Comm: syz-executor603 Not tainted 5.18.0-rc6-next-20220513-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:follow_hugetlb_page+0x1326/0x1c80 mm/hugetlb.c:6250 > Code: 89 44 24 70 e8 2b 1d b7 ff 48 8b 44 24 70 48 85 c0 0f 84 f1 07 00 00 e8 88 1a b7 ff 48 83 ed 01 e9 09 fb ff ff e8 7a 1a b7 ff <0f> 0b 48 8b 7c 24 30 bb f4 ff ff ff e8 69 74 b8 07 4c 8b a4 24 b8 > RSP: 0018:ffffc90002f6f7e0 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff88801bdd4e00 RCX: 0000000000000000 > RDX: ffff88801e4e3a80 RSI: ffffffff81c38f76 RDI: 0000000000000003 > RBP: ffffea0001fe8680 R08: 0000000000000000 R09: 0000000000000003 > R10: ffffffff81b128fb R11: 0000000000000008 R12: 000000000000001a > R13: ffff88801bdd4e00 R14: ffff88801bdd5600 R15: 0000000000000019 > FS: 0000555556ad2300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000458 CR3: 000000001e850000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > __get_user_pages+0x27a/0xfa0 mm/gup.c:1146 > __get_user_pages_locked mm/gup.c:1365 [inline] > __gup_longterm_locked+0x1d5/0xfe0 mm/gup.c:1985 > pin_user_pages+0x8e/0xe0 mm/gup.c:3118 > io_sqe_buffer_register+0x254/0x1710 fs/io_uring.c:10537 > io_sqe_buffers_register.cold+0x28e/0x443 fs/io_uring.c:10664 > __io_uring_register fs/io_uring.c:12682 [inline] > __do_sys_io_uring_register+0xd21/0x1930 fs/io_uring.c:12816 > 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+0x46/0xb0 > RIP: 0033:0x7f5f42760cc9 > 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:00007fffc3407aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab > RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f5f42760cc9 > RDX: 0000000020000380 RSI: 0000000000000000 RDI: 0000000000000004 > RBP: 00007f5f42724e70 R08: 0000000010000000 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000246 R12: 00007f5f42724f00 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK>
