WARNING: lock held when returning to user space in srcu_lock

WARNING: lock held when returning to user space in srcu_lock_acquire

Status: upstream: reported C repro on 2024/05/13 11:21
Subsystems: bcachefs rcu
[Documentation on labels]
Reported-by: syzbot+d797fe78808e968d6c84@syzkaller.appspotmail.com
Fix commit: 70dd062e27e6 bcachefs: Fix btree_trans leak in bch2_readahead()
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb], missing on: [ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64]
First crash: 22d, last: 20d

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
[syzbot] [bcachefs?] [rcu?] WARNING: lock held when returning to user space in srcu_lock_acquire	0 (1)	2024/05/13 11:21

Sample crash report:

 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
================================================
WARNING: lock held when returning to user space!
6.9.0-rc7-syzkaller-g1c9135d29e9e #0 Not tainted
------------------------------------------------
syz-executor367/6238 is leaving the kernel with locks still held!
1 lock held by syz-executor367/6238:
 #0: ffff0000dcc84250 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:115

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2024/05/09 11:30	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	1c9135d29e9e	20bf80e1	.config	console log	report	syz	C		[disk image] [vmlinux] [kernel image] [mounted in repro]	ci-upstream-gce-arm64	WARNING: lock held when returning to user space in srcu_lock_acquire
2024/05/12 06:06	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	fda5695d692c	9026e142	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-gce-arm64	WARNING: lock held when returning to user space in srcu_lock_acquire
2024/05/09 11:12	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	1c9135d29e9e	20bf80e1	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-gce-arm64	WARNING: lock held when returning to user space in srcu_lock_acquire

* ~~Struck through~~ repros no longer work on HEAD.