syzbot


BUG: sleeping function called from invalid context in vma_alloc_folio_noprof

Status: fixed on 2024/08/14 03:44
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+a3e82ae343b26b4d2335@syzkaller.appspotmail.com
Fix commit: 280e36f0d5b9 nsfs: use cleanup guard
First crash: 145d, last: 145d
Cause bisection: introduced by (bisect log) :
commit ca567df74a28a9fb368c6b2d93e864113f73f5c2
Author: Christian Brauner <brauner@kernel.org>
Date: Sun Jun 7 20:47:08 2020 +0000

  nsfs: add pid translation ioctls

Crash: WARNING: lock held when returning to user space in ns_ioctl (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] nsfs: use cleanup guard 2 (2) 2024/07/16 07:28
[syzbot] [mm?] BUG: sleeping function called from invalid context in vma_alloc_folio_noprof 1 (2) 2024/07/16 03:51

Sample crash report:
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 5092, name: syz-executor156
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
INFO: lockdep is turned off.
CPU: 1 UID: 0 PID: 5092 Comm: syz-executor156 Not tainted 6.10.0-rc7-next-20240712-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 __might_resched+0x5d4/0x780 kernel/sched/core.c:8526
 might_alloc include/linux/sched/mm.h:337 [inline]
 prepare_alloc_pages+0x1c9/0x5d0 mm/page_alloc.c:4503
 __alloc_pages_noprof+0x166/0x6c0 mm/page_alloc.c:4721
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263
 folio_alloc_mpol_noprof mm/mempolicy.c:2281 [inline]
 vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2312
 folio_prealloc+0x31/0x170
 wp_page_copy mm/memory.c:3342 [inline]
 do_wp_page+0x11cc/0x52f0 mm/memory.c:3734
 handle_pte_fault+0x1138/0x6eb0 mm/memory.c:5545
 __handle_mm_fault mm/memory.c:5672 [inline]
 handle_mm_fault+0xff1/0x19a0 mm/memory.c:5837
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f3a8171eb80
Code: 84 dd fe ff ff 4c 89 e7 e8 ed 90 00 00 e9 d0 fe ff ff 0f 1f 84 00 00 00 00 00 49 8b 06 48 89 45 00 48 85 c0 0f 85 85 00 00 00 <c6> 05 49 25 0a 00 01 31 c0 87 05 19 21 0a 00 83 f8 01 0f 8f 84 00
RSP: 002b:00007ffc347a4150 EFLAGS: 00010246

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/14 23:53 linux-next 3fe121b62282 eaeb5c15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in vma_alloc_folio_noprof
* Struck through repros no longer work on HEAD.