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9LxZC2jVDfQL6tXOAZdZHXuTCJBbXDJ30oxZXrn/nOAgqpfQozePdGXEO7Z8uqaRhAm6RSnT9RNpgpVB3fKN41EgtnKOMFVqCUPiegMUyPk8UG1NBn2yK3sb3+SMnqKeZCn7Ms3Ze9QP/kFLCl7BvnKClY8tK5MHOVhtSt2iH7yQUaC9nX8YKJJpYaoqTNKJiVuoo523+EhTrHe2UUYxR58D8CWqkc3rcdu7yXg0KYAFIViREM2odAVy2O2plfkt41N8VhHcz7kB30y5eCOEHS0Dzr8+juKk 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: On 2/13/26 4:26 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 05f7e89ab973 Linux 6.19 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16c324aa580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9682a42d8ec8b05c > dashboard link: https://syzkaller.appspot.com/bug?extid=2aee6839a252e612ce34 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/b9c0cdc82aa9/disk-05f7e89a.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/e43670d95943/vmlinux-05f7e89a.xz > kernel image: https://storage.googleapis.com/syzbot-assets/2c8401722932/bzImage-05f7e89a.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+2aee6839a252e612ce34@syzkaller.appspotmail.com I wasn't able to boot a KMSAN kernel locally to test at all, but I did notice some page allocation paths that call post_alloc_hook() but skip kmsan_alloc_page(), leaving stale KMSAN shadow on allocated pages: alloc_pages_bulk_noprof() split_free_pages() alloc_contig_range_noprof() (compound path) So it is possible that we arrived here via the page_pool network allocator, which calls alloc_pages_bulk_noprof(). Then later, the page is passed into follow_page_pte(). thanks, John Hubbard > > ===================================================== > BUG: KMSAN: uninit-value in follow_page_pte+0x385/0x15b0 mm/gup.c:816 > follow_page_pte+0x385/0x15b0 mm/gup.c:816 > follow_pmd_mask mm/gup.c:915 [inline] > follow_pud_mask mm/gup.c:967 [inline] > follow_p4d_mask mm/gup.c:984 [inline] > follow_page_mask mm/gup.c:1023 [inline] > __get_user_pages+0x1524/0x5f00 mm/gup.c:1426 > __get_user_pages_locked mm/gup.c:1692 [inline] > get_dump_page+0x142/0x570 mm/gup.c:2192 > dump_user_range+0x26e/0x2230 fs/coredump.c:1366 > elf_core_dump+0x697f/0x6c30 fs/binfmt_elf.c:2111 > coredump_write+0x209c/0x2d30 fs/coredump.c:1049 > do_coredump fs/coredump.c:1126 [inline] > vfs_coredump+0x7a08/0x8d90 fs/coredump.c:1200 > get_signal+0x2068/0x29d0 kernel/signal.c:3019 > arch_do_signal_or_restart+0x53/0xc00 arch/x86/kernel/signal.c:337 > __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] > exit_to_user_mode_loop kernel/entry/common.c:75 [inline] > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] > irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] > irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] > irqentry_exit+0xef/0x6d0 kernel/entry/common.c:196 > exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1530 > asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 > > Uninit was stored to memory at: > ext4_xattr_set_entry+0x1312/0x3440 fs/ext4/xattr.c:1740 > ext4_xattr_block_set+0xc74/0x5040 fs/ext4/xattr.c:2030 > ext4_xattr_set_handle+0x1e25/0x2b10 fs/ext4/xattr.c:2457 > ext4_xattr_set+0x2ff/0x5a0 fs/ext4/xattr.c:2559 > ext4_xattr_trusted_set+0x51/0x70 fs/ext4/xattr_trusted.c:38 > __vfs_setxattr+0x742/0x840 fs/xattr.c:200 > __vfs_setxattr_noperm+0x224/0xad0 fs/xattr.c:234 > __vfs_setxattr_locked+0x43c/0x480 fs/xattr.c:295 > vfs_setxattr+0x28d/0x650 fs/xattr.c:321 > do_setxattr fs/xattr.c:636 [inline] > filename_setxattr+0x3a4/0xcc0 fs/xattr.c:665 > path_setxattrat+0x6c8/0x7c0 fs/xattr.c:713 > __do_sys_lsetxattr fs/xattr.c:754 [inline] > __se_sys_lsetxattr fs/xattr.c:750 [inline] > __x64_sys_lsetxattr+0x103/0x1c0 fs/xattr.c:750 > x64_sys_call+0x3c8b/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:190 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was created at: > __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5263 > alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 > alloc_frozen_pages_noprof+0xf6/0x200 mm/mempolicy.c:2557 > alloc_slab_page mm/slub.c:3075 [inline] > allocate_slab+0x1ea/0x1700 mm/slub.c:3248 > new_slab mm/slub.c:3302 [inline] > ___slab_alloc+0x1048/0x38b0 mm/slub.c:4656 > __slab_alloc+0xa3/0x180 mm/slub.c:4779 > __slab_alloc_node mm/slub.c:4855 [inline] > slab_alloc_node mm/slub.c:5251 [inline] > __kmalloc_cache_noprof+0x9e0/0x1710 mm/slub.c:5775 > kmalloc_noprof include/linux/slab.h:957 [inline] > kzalloc_noprof include/linux/slab.h:1094 [inline] > sctp_transport_new+0xb2/0xb60 net/sctp/transport.c:95 > sctp_assoc_add_peer+0x440/0x22b0 net/sctp/associola.c:617 > sctp_process_param net/sctp/sm_make_chunk.c:2546 [inline] > sctp_process_init+0x11b0/0x3bc0 net/sctp/sm_make_chunk.c:2366 > sctp_cmd_process_init net/sctp/sm_sideeffect.c:712 [inline] > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1395 [inline] > sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] > sctp_do_sm+0x1719/0x9b30 net/sctp/sm_sideeffect.c:1175 > sctp_assoc_bh_rcv+0x88b/0xbc0 net/sctp/associola.c:1034 > sctp_inq_push+0x29d/0x350 net/sctp/inqueue.c:88 > sctp_backlog_rcv+0x3ca/0xd80 net/sctp/input.c:331 > sk_backlog_rcv include/net/sock.h:1177 [inline] > __release_sock+0x3fb/0x7d0 net/core/sock.c:3213 > release_sock+0x6b/0x260 net/core/sock.c:3795 > sctp_wait_for_connect+0x451/0x810 net/sctp/socket.c:9393 > __sctp_connect+0x1483/0x15a0 net/sctp/socket.c:1248 > __sctp_setsockopt_connectx net/sctp/socket.c:1337 [inline] > sctp_getsockopt_connectx3+0x7e5/0x8a0 net/sctp/socket.c:1422 > sctp_getsockopt+0xd9b/0x14c0 net/sctp/socket.c:8174 > sock_common_getsockopt+0x9c/0xf0 net/core/sock.c:3946 > do_sock_getsockopt+0x3a8/0x4c0 net/socket.c:2383 > __sys_getsockopt net/socket.c:2412 [inline] > __do_sys_getsockopt net/socket.c:2419 [inline] > __se_sys_getsockopt net/socket.c:2416 [inline] > __x64_sys_getsockopt+0x32d/0x520 net/socket.c:2416 > x64_sys_call+0x3a97/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:56 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 0 UID: 0 PID: 9815 Comm: syz.4.1167 Not tainted syzkaller #0 PREEMPT(voluntary) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 > ===================================================== > > > --- > 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@googlegroups.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