kernel BUG in bch2_journal_res

kernel BUG in bch2_journal_res_get

Status: upstream: reported C repro on 2024/06/13 12:39
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+ffd2270f0bca3322ee00@syzkaller.appspotmail.com
Fix commit: dbf4d79b7fc7 bcachefs: Fix early init error path in journal code
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-gce-arm64 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 ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb]
First crash: 16d, last: 16d

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_journal_res_get	1 (2)	2024/06/17 13:37

Sample crash report:

bcachefs (loop0): flushing journal and stopping allocators, journal seq 11
bcachefs (loop0): flushing journal and stopping allocators complete, journal seq 11
------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal.h:375!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6249 Comm: syz-executor102 Tainted: G        W          6.10.0-rc2-syzkaller-g8867bbd4a056 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bch2_journal_res_get+0x1a8/0x1b4 fs/bcachefs/journal.h:375
lr : bch2_journal_res_get+0x1a8/0x1b4 fs/bcachefs/journal.h:375
sp : ffff80009b3076e0
x29: ffff80009b3076e0 x28: 1fffe0001bf4957f x27: 0000000000000002
x26: dfff800000000000 x25: 1ffff00013660ee8 x24: dfff800000000000
x23: 1ffff00013660eec x22: dfff800000000000 x21: 0000000000000005
x20: ffff0000dfa4a5c0 x19: ffff80009b307760 x18: 0000000000000008
x17: 6c706d6f63207372 x16: ffff80008ae4f3c0 x15: 0000000000000002
x14: 1ffff00013660eec x13: 0000000000000000 x12: 0000000000000000
x11: ffff700013660eee x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000d62fbc80 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 bch2_journal_res_get+0x1a8/0x1b4 fs/bcachefs/journal.h:375
 bch2_journal_meta+0x9c/0x268 fs/bcachefs/journal.c:828
 bch2_fs_journal_stop+0x188/0x348 fs/bcachefs/journal.c:1179
 __bch2_fs_read_only+0x2a4/0x3d0 fs/bcachefs/super.c:291
 __bch2_fs_read_write+0x2f0/0x434 fs/bcachefs/super.c:507
 bch2_fs_read_write+0xa8/0xf0 fs/bcachefs/super.c:520
 bch2_remount+0x2bc/0x460 fs/bcachefs/fs.c:1731
 legacy_reconfigure+0xfc/0x114 fs/fs_context.c:685
 reconfigure_super+0x1d0/0x6f0 fs/super.c:1072
 vfs_cmd_reconfigure fs/fsopen.c:267 [inline]
 vfs_fsconfig_locked fs/fsopen.c:296 [inline]
 __do_sys_fsconfig fs/fsopen.c:476 [inline]
 __se_sys_fsconfig fs/fsopen.c:349 [inline]
 __arm64_sys_fsconfig+0x8b8/0xc40 fs/fsopen.c:349
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 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
Code: 17ffffab 9770cd61 d4210000 9770cd5f (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2024/06/09 12:52	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	8867bbd4a056	82c05ab8	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image] [mounted in repro]	ci-upstream-gce-arm64	kernel BUG in bch2_journal_res_get
2024/06/09 12:32	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	8867bbd4a056	82c05ab8	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-gce-arm64	kernel BUG in bch2_journal_res_get

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