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Message-ID: <677c7e5b.050a0220.3b3668.00f9.GAE@google.com> Date: Mon, 06 Jan 2025 17:07:39 -0800 From: syzbot <syzbot+a504cb5bae4fe117ba94@...kaller.appspotmail.com> To: vivek.kasireddy@...el.com Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, muchun.song@...ux.dev, syzkaller-bugs@...glegroups.com, vivek.kasireddy@...el.com Subject: Re: RE: [syzbot] [mm?] kernel BUG in alloc_hugetlb_folio_reserve >> >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 63676eefb7a0 Merge tag 'sched_ext-for-6.13-rc5-fixes' of g.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=15fb66f8580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=1c541fa8af5c9cc7 >> dashboard link: >> https://syzkaller.appspot.com/bug?extid=a504cb5bae4fe117ba94 >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) >> 2.40 >> >> Unfortunately, I don't have any reproducer for this issue yet. >> >> Downloadable assets: >> disk image (non-bootable): https://storage.googleapis.com/syzbot- >> assets/7feb34a89c2a/non_bootable_disk-63676eef.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot- >> assets/599e1a07ba5c/vmlinux-63676eef.xz >> kernel image: https://storage.googleapis.com/syzbot- >> assets/b52f3534bdbe/bzImage-63676eef.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+a504cb5bae4fe117ba94@...kaller.appspotmail.com >> >> ------------[ cut here ]------------ >> kernel BUG at mm/hugetlb.c:2403! >> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI >> CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller- >> 00161-g63676eefb7a0 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, >> 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 >> RIP: 0010:alloc_hugetlb_folio_reserve+0xbc/0xc0 mm/hugetlb.c:2403 >> Code: 1f eb 05 e8 56 18 a0 ff 48 c7 c7 40 56 61 8e e8 ba 21 cc 09 4c 89 f0 5b 41 >> 5c 41 5e 41 5f 5d c3 cc cc cc cc e8 35 18 a0 ff 90 <0f> 0b 66 90 90 90 90 90 90 >> 90 90 90 90 90 90 90 90 90 90 90 f3 0f >> RSP: 0018:ffffc9000d3d77f8 EFLAGS: 00010087 >> RAX: ffffffff81ff6beb RBX: 0000000000000000 RCX: 0000000000100000 >> RDX: ffffc9000e51a000 RSI: 00000000000003ec RDI: 00000000000003ed >> RBP: 1ffffffff34810d9 R08: ffffffff81ff6ba3 R09: 1ffffd4000093005 >> R10: dffffc0000000000 R11: fffff94000093006 R12: dffffc0000000000 >> R13: dffffc0000000000 R14: ffffea0000498000 R15: ffffffff9a4086c8 >> FS: 00007f77ac12e6c0(0000) GS:ffff88801fc00000(0000) >> knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00007f77ab54b170 CR3: 0000000040b70000 CR4: 0000000000352ef0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call >> Trace: >> <TASK> >> memfd_alloc_folio+0x1bd/0x370 mm/memfd.c:88 >> memfd_pin_folios+0xf10/0x1570 mm/gup.c:3750 udmabuf_pin_folios >> drivers/dma-buf/udmabuf.c:346 [inline] >> udmabuf_create+0x70e/0x10c0 drivers/dma-buf/udmabuf.c:443 >> udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:495 [inline] >> udmabuf_ioctl+0x301/0x4e0 drivers/dma-buf/udmabuf.c:526 vfs_ioctl >> fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] >> __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f77ab385d29 >> 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:00007f77ac12e038 EFLAGS: 00000246 ORIG_RAX: >> 0000000000000010 >> RAX: ffffffffffffffda RBX: 00007f77ab575fa0 RCX: 00007f77ab385d29 >> RDX: 0000000020000040 RSI: 0000000040187542 RDI: 0000000000000006 >> RBP: 00007f77ab401b08 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> R13: 0000000000000000 R14: 00007f77ab575fa0 R15: 00007fff748b7238 >> </TASK> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:alloc_hugetlb_folio_reserve+0xbc/0xc0 mm/hugetlb.c:2403 >> Code: 1f eb 05 e8 56 18 a0 ff 48 c7 c7 40 56 61 8e e8 ba 21 cc 09 4c 89 f0 5b 41 >> 5c 41 5e 41 5f 5d c3 cc cc cc cc e8 35 18 a0 ff 90 <0f> 0b 66 90 90 90 90 90 90 >> 90 90 90 90 90 90 90 90 90 90 90 f3 0f >> RSP: 0018:ffffc9000d3d77f8 EFLAGS: 00010087 >> RAX: ffffffff81ff6beb RBX: 0000000000000000 RCX: 0000000000100000 >> RDX: ffffc9000e51a000 RSI: 00000000000003ec RDI: 00000000000003ed >> RBP: 1ffffffff34810d9 R08: ffffffff81ff6ba3 R09: 1ffffd4000093005 >> R10: dffffc0000000000 R11: fffff94000093006 R12: dffffc0000000000 >> R13: dffffc0000000000 R14: ffffea0000498000 R15: ffffffff9a4086c8 >> FS: 00007f77ac12e6c0(0000) GS:ffff88801fc00000(0000) >> knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00007f77ab54b170 CR3: 0000000040b70000 CR4: 0000000000352ef0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> >> >> --- >> 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 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 > > #syz test: https://gitlab.freedesktop.org/Vivek/drm-tip.git syzbot_fix_htlb_reserve This crash does not have a reproducer. I cannot test it. >
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