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tNyZhyT7H9Zxw3cdb6yA/8xhDx9Z9PQJ6+gs/6x8+NiPaX2uhuc3YVew495b0fuCyVO53RaX60B7y6l+z4whrXB7QEVFNBK9u1ugsDHG4kG5JKsmY1JVqaTRa8S4if7KkZXRCqH6B+2tDHwq6rfuOq8We9efj3Fe X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --=_MailMate_31522DB3-C8E7-4FAD-A0F3-FE8FCE819C13_= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On 14 Feb 2025, at 10:48, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: df5d6180169a Add linux-next specific files for 20250210= > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D16d343f8580= 000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D2cd616b6e73= 6ca7 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D012c6245eaea0= e23f7f9 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for D= ebian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D138972a45= 80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D11737b18580= 000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/92495cf20271/d= isk-df5d6180.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4b3656161842/vmli= nux-df5d6180.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7fbc4e7a0f5d= /bzImage-df5d6180.xz > > The issue was bisected to: > > commit 19c067c8a0f18b62d4a4235b0b327624c86f2e40 > Author: Zi Yan > Date: Wed Feb 5 03:14:13 2025 +0000 > > mm/huge_memory: add buddy allocator like folio_split() > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D102f9bdf= 980000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D122f9bdf= 980000 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D142f9bdf980= 000 > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > Reported-by: syzbot+012c6245eaea0e23f7f9@syzkaller.appspotmail.com > Fixes: 19c067c8a0f1 ("mm/huge_memory: add buddy allocator like folio_sp= lit()") > > Oops: general protection fault, probably for non-canonical address 0xdf= fffc0000000024: 0000 [#1] PREEMPT SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127] > CPU: 1 UID: 0 PID: 5949 Comm: syz-executor163 Not tainted 6.14.0-rc2-ne= xt-20250210-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 12/27/2024 > RIP: 0010:shmem_mapping+0x25/0x50 mm/shmem.c:281 > Code: 90 90 90 90 90 f3 0f 1e fa 53 48 89 fb e8 c3 3a bd ff 48 81 c3 20= 01 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 0= 0 74 08 48 89 df e8 dd 35 24 00 48 c7 c0 80 6c 14 8c 48 > RSP: 0018:ffffc90004036dd8 EFLAGS: 00010006 > RAX: 0000000000000024 RBX: 0000000000000120 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: 0000000000000600 RDI: 0000000000000000 > RBP: 0000000000000600 R08: ffffffff822bcf18 R09: 1ffffd4000331008 > R10: dffffc0000000000 R11: fffff94000331009 R12: ffffea0001988018 > R13: ffffea0001988080 R14: ffffea0001988018 R15: ffffea0001988000 > FS: 00007f5e045316c0(0000) GS:ffff8880b8700000(0000) knlGS:00000000000= 00000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f5e0458dae0 CR3: 0000000023c78000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __split_unmapped_folio+0x238a/0x3e50 mm/huge_memory.c:3587 > __folio_split+0x1267/0x16d0 mm/huge_memory.c:3871 > try_folio_split include/linux/huge_mm.h:374 [inline] > truncate_inode_partial_folio+0x55d/0xdc0 mm/truncate.c:230 > shmem_undo_range+0xab7/0x1820 mm/shmem.c:1144 > shmem_truncate_range mm/shmem.c:1224 [inline] > shmem_fallocate+0x431/0xf20 mm/shmem.c:3674 > vfs_fallocate+0x623/0x7a0 fs/open.c:338 > madvise_remove mm/madvise.c:1034 [inline] > madvise_vma_behavior mm/madvise.c:1269 [inline] > madvise_walk_vmas mm/madvise.c:1511 [inline] > madvise_do_behavior+0x1f29/0x3c00 mm/madvise.c:1646 > do_madvise mm/madvise.c:1744 [inline] > __do_sys_madvise mm/madvise.c:1752 [inline] > __se_sys_madvise mm/madvise.c:1750 [inline] > __x64_sys_madvise+0x11b/0x140 mm/madvise.c:1750 > 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: 0033:0x7f5e04576519 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 f= 0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f5e04531218 EFLAGS: 00000246 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 00007f5e04600308 RCX: 00007f5e04576519 > RDX: 0000000000000009 RSI: 0000000000600003 RDI: 0000400000000000 > RBP: 00007f5e04600300 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5e045cd074 > R13: 0000400000000000 R14: 0000400000000140 R15: 0000400000000040 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:shmem_mapping+0x25/0x50 mm/shmem.c:281 > Code: 90 90 90 90 90 f3 0f 1e fa 53 48 89 fb e8 c3 3a bd ff 48 81 c3 20= 01 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 0= 0 74 08 48 89 df e8 dd 35 24 00 48 c7 c0 80 6c 14 8c 48 > RSP: 0018:ffffc90004036dd8 EFLAGS: 00010006 > RAX: 0000000000000024 RBX: 0000000000000120 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: 0000000000000600 RDI: 0000000000000000 > RBP: 0000000000000600 R08: ffffffff822bcf18 R09: 1ffffd4000331008 > R10: dffffc0000000000 R11: fffff94000331009 R12: ffffea0001988018 > R13: ffffea0001988080 R14: ffffea0001988018 R15: ffffea0001988000 > FS: 00007f5e045316c0(0000) GS:ffff8880b8700000(0000) knlGS:00000000000= 00000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f5e0458dae0 CR3: 0000000023c78000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 90 nop > 1: 90 nop > 2: 90 nop > 3: 90 nop > 4: 90 nop > 5: f3 0f 1e fa endbr64 > 9: 53 push %rbx > a: 48 89 fb mov %rdi,%rbx > d: e8 c3 3a bd ff call 0xffbd3ad5 > 12: 48 81 c3 20 01 00 00 add $0x120,%rbx > 19: 48 89 d8 mov %rbx,%rax > 1c: 48 c1 e8 03 shr $0x3,%rax > 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx > 27: fc ff df > * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping inst= ruction > 2e: 74 08 je 0x38 > 30: 48 89 df mov %rbx,%rdi > 33: e8 dd 35 24 00 call 0x243615 > 38: 48 c7 c0 80 6c 14 8c mov $0xffffffff8c146c80,%rax > 3f: 48 rex.W OK, I figured out how to trigger syzkaller to do the test. The attached patch includes both the fix and the __split_folio_to_order() change discussed at https://lore.kernel.org/linux-mm/d989ef66-4a4b-4679-b2e9-f05= 916ca3672@redhat.com/. I will paste the patch to my original patch email once syzkaller confirms it fixes the issue. #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.= git df5d6180169a Best Regards, Yan, Zi --=_MailMate_31522DB3-C8E7-4FAD-A0F3-FE8FCE819C13_= Content-Disposition: attachment; filename=0001-mm-huge_memory-do-not-drop-the-original-folio-during.patch Content-ID: <320C8478-4090-4D12-8DB3-FB762B049C73@nvidia.com> Content-Type: text/plain; name=0001-mm-huge_memory-do-not-drop-the-original-folio-during.patch Content-Transfer-Encoding: quoted-printable >From a6bd83dfbb1143f1614ede4817cccb1e8cc6290d Mon Sep 17 00:00:00 2001 From: Zi Yan Date: Fri, 14 Feb 2025 16:18:24 -0500 Subject: [PATCH] mm/huge_memory: do not drop the original folio during truncate. The caller expects to handle the original folio itself. also make __split_unmapped_folio() never fail, per discussion with David Hildenbrand. Signed-off-by: Zi Yan --- mm/huge_memory.c | 22 ++++++---------------- 1 file changed, 6 insertions(+), 16 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2eda2a9ec8fc..87cb62c81bf3 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3292,16 +3292,12 @@ bool can_split_folio(struct folio *folio, int calle= r_pins, int *pextra_pins) * It splits @folio into @new_order folios and copies the @folio metadata = to * all the resulting folios. */ -static int __split_folio_to_order(struct folio *folio, int new_order) +static void __split_folio_to_order(struct folio *folio, int new_order) { - int curr_order =3D folio_order(folio); long nr_pages =3D folio_nr_pages(folio); long new_nr_pages =3D 1 << new_order; long index; =20 - if (curr_order <=3D new_order) - return -EINVAL; - /* * Skip the first new_nr_pages, since the new folio from them have all * the flags from the original folio. @@ -3396,8 +3392,6 @@ static int __split_folio_to_order(struct folio *folio= , int new_order) =20 if (!new_order) ClearPageCompound(&folio->page); - - return 0; } =20 /* @@ -3491,7 +3485,6 @@ static int __split_unmapped_folio(struct folio *folio= , int new_order, int old_order =3D folio_order(folio); struct folio *release; struct folio *end_folio =3D folio_next(folio); - int status; =20 /* order-1 anonymous folio is not supported */ if (folio_test_anon(folio) && split_order =3D=3D 1) @@ -3524,12 +3517,7 @@ static int __split_unmapped_folio(struct folio *foli= o, int new_order, split_page_owner(&folio->page, old_order, split_order); pgalloc_tag_split(folio, old_order, split_order); =20 - status =3D __split_folio_to_order(folio, split_order); - - if (status < 0) { - stop_split =3D true; - ret =3D -EINVAL; - } + __split_folio_to_order(folio, split_order); =20 after_split: /* @@ -3567,8 +3555,10 @@ static int __split_unmapped_folio(struct folio *foli= o, int new_order, folio_test_swapcache(origin_folio)) ? folio_nr_pages(release) : 0)); =20 - if (release !=3D origin_folio) - lru_add_page_tail(origin_folio, &release->page, + if (release =3D=3D origin_folio) + continue; + =09 + lru_add_page_tail(origin_folio, &release->page, lruvec, list); =20 /* Some pages can be beyond EOF: drop them from page cache */ --=20 2.47.2 --=_MailMate_31522DB3-C8E7-4FAD-A0F3-FE8FCE819C13_=--