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KMSAN: uninit-value in full_proxy_poll

Status: upstream: reported C repro on 2025/02/03 01:14
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+a84ce0b8e1f3da037bf7@syzkaller.appspotmail.com
First crash: 6d05h, last: 3d06h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll 1 (3) 2025/02/03 01:40
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/02/03 01:40 34m charmitro@posteo.net git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 57b314752ec0ad42685bc78b376326f1f4c04669 OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411
 full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411
 vfs_poll include/linux/poll.h:82 [inline]
 ep_item_poll fs/eventpoll.c:1060 [inline]
 ep_insert+0x19c7/0x2740 fs/eventpoll.c:1736
 do_epoll_ctl+0xd83/0x17f0 fs/eventpoll.c:2394
 __do_sys_epoll_ctl fs/eventpoll.c:2445 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2436 [inline]
 __x64_sys_epoll_ctl+0x1b5/0x210 fs/eventpoll.c:2436
 x64_sys_call+0x1658/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:234
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 __debugfs_file_get+0xe86/0xef0 fs/debugfs/file.c:122
 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447
 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955
 vfs_open+0x53/0x5b0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x56a1/0x6250 fs/namei.c:3989
 do_filp_open+0x268/0x600 fs/namei.c:4016
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1453
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 __debugfs_file_get+0xe59/0xef0 fs/debugfs/file.c:120
 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447
 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955
 vfs_open+0x53/0x5b0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x56a1/0x6250 fs/namei.c:3989
 do_filp_open+0x268/0x600 fs/namei.c:4016
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1453
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 __debugfs_file_get+0xdff/0xef0 fs/debugfs/file.c:118
 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447
 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955
 vfs_open+0x53/0x5b0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x56a1/0x6250 fs/namei.c:3989
 do_filp_open+0x268/0x600 fs/namei.c:4016
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1453
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 __debugfs_file_get+0x31d/0xef0 fs/debugfs/file.c:101
 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447
 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955
 vfs_open+0x53/0x5b0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x56a1/0x6250 fs/namei.c:3989
 do_filp_open+0x268/0x600 fs/namei.c:4016
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1453
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5778 Comm: syz-executor303 Not tainted 6.13.0-syzkaller-09585-gb4b0881156fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
=====================================================

Crashes (76):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/31 08:58 upstream b4b0881156fb 4c6ac32f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 19:02 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 17:05 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 15:53 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 10:58 upstream 60c828cf80c0 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 05:59 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 05:36 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 04:19 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 03:25 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 01:05 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 00:28 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 00:28 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 00:13 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 00:12 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 22:23 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 22:22 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 07:20 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 07:20 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 06:35 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 21:50 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 21:50 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 20:45 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 20:45 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 16:46 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 01:07 upstream 05dbaf8dd8bf afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 01:07 upstream 05dbaf8dd8bf afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in full_proxy_poll
2025/02/02 00:25 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 23:20 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 21:59 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 20:37 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 18:45 upstream 60c828cf80c0 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 06:33 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 06:33 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 02:32 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/02/01 02:31 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 23:45 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 23:45 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 11:11 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 11:11 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 10:08 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 10:07 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 09:35 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 08:49 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 08:48 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 06:55 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 06:55 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 06:34 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/31 06:28 upstream b4b0881156fb 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 23:03 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
2025/01/30 22:57 upstream 72deda0abee6 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in full_proxy_poll
* Struck through repros no longer work on HEAD.