linux-kernel - [syzbot] [fs?] BUG: sleeping function called from invalid context in vfree (2)

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Message-ID: <68a2decd.050a0220.e29e5.009a.GAE@google.com>
Date: Mon, 18 Aug 2025 01:05:33 -0700
From: syzbot <syzbot+f65a2014305525a9f816@...kaller.appspotmail.com>
To: andrealmeid@...lia.com, dave@...olabs.net, dvhart@...radead.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...hat.com, 
	peterz@...radead.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: [syzbot] [fs?] BUG: sleeping function called from invalid context in
 vfree (2)

Hello,

syzbot found the following issue on:

HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15232442580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
dashboard link: https://syzkaller.appspot.com/bug?extid=f65a2014305525a9f816
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14cbaba2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1157faf0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f65a2014305525a9f816@...kaller.appspotmail.com

BUG: sleeping function called from invalid context at mm/vmalloc.c:3409
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6664, name: syz-executor
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
no locks held by syz-executor/6664.
Preemption disabled at:
[<ffff80008b015088>] __schedule_loop kernel/sched/core.c:7042 [inline]
[<ffff80008b015088>] schedule+0xac/0x230 kernel/sched/core.c:7058
CPU: 0 UID: 0 PID: 6664 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 __might_resched+0x348/0x4c4 kernel/sched/core.c:8957
 __might_sleep+0x94/0x110 kernel/sched/core.c:8886
 vfree+0xa0/0x3dc mm/vmalloc.c:3409
 kvfree+0x24/0x40 mm/slub.c:5093
 futex_hash_free+0x84/0x9c kernel/futex/core.c:1742
 __mmdrop+0x2c0/0x4ec kernel/fork.c:692
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_sched include/linux/sched/mm.h:83 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
 finish_task_switch+0x4a0/0x5a4 kernel/sched/core.c:5250
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x13b4/0x2864 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:7058
 do_nanosleep+0x174/0x508 kernel/time/hrtimer.c:2100
 hrtimer_nanosleep+0x154/0x2a4 kernel/time/hrtimer.c:2147
 common_nsleep+0xa0/0xb8 kernel/time/posix-timers.c:1353
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1399 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1376 [inline]
 __arm64_sys_clock_nanosleep+0x328/0x364 kernel/time/posix-timers.c:1376
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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