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WARNING: suspicious RCU usage in gfs2_permission

Status: fixed on 2023/12/21 03:45
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+3e5130844b0c0e2b4948@syzkaller.appspotmail.com
Fix commit: 074d7306a4fe gfs2: Silence "suspicious RCU usage in gfs2_permission" warning
First crash: 203d, last: 179d
Cause bisection: introduced by (bisect log) :
commit 0abd1557e21c617bd13fc18f7725fc6363c05913
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon Oct 2 02:33:44 2023 +0000

  gfs2: fix an oops in gfs2_permission

Crash: WARNING: suspicious RCU usage in gfs2_permission (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [gfs2?] WARNING: suspicious RCU usage in gfs2_permission 2 (5) 2023/10/30 21:05

Sample crash report:
gfs2: fsid=syz:syz.0: journal 0 mapped with 12 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
=============================
WARNING: suspicious RCU usage
6.6.0-rc7-next-20231026-syzkaller #0 Not tainted
-----------------------------
fs/gfs2/inode.c:1878 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
no locks held by syz-executor250/5076.

stack backtrace:
CPU: 0 PID: 5076 Comm: syz-executor250 Not tainted 6.6.0-rc7-next-20231026-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x20b/0x3a0 kernel/locking/lockdep.c:6711
 gfs2_permission+0x3f8/0x4c0 fs/gfs2/inode.c:1878
 do_inode_permission fs/namei.c:462 [inline]
 inode_permission fs/namei.c:529 [inline]
 inode_permission+0x384/0x5e0 fs/namei.c:504
 may_open+0x11c/0x400 fs/namei.c:3249
 do_open fs/namei.c:3620 [inline]
 path_openat+0x6c9/0x2c40 fs/namei.c:3779
 do_filp_open+0x1dc/0x430 fs/namei.c:3809
 do_sys_openat2+0x176/0x1e0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f67838e9a11
Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 7a b6 08 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25
RSP: 002b:00007fffeb32c830 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007f67838e9a11
RDX: 0000000000010000 RSI: 0000000020000140 RDI: 00000000ffffff9c
RBP: 0000000020000140 R08: 00007fffeb32c8f0 R09: 00000000000125c1
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffeb32c8f0
R13: 0000000000000003 R14: 0000000001000000 R15: 00007f678393303b
 </TASK>

Crashes (263):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/26 19:39 linux-next 2ef7141596ee 23afc60f .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/18 14:27 linux-next 2dac75696c6d 342b9c55 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/31 05:39 linux-next c503e3eec382 b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/31 04:49 linux-next c503e3eec382 b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/31 01:41 linux-next c503e3eec382 b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 17:27 linux-next c503e3eec382 b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 14:06 linux-next c503e3eec382 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 10:24 linux-next c503e3eec382 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 08:57 linux-next c503e3eec382 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 07:44 linux-next c503e3eec382 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/30 05:58 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 23:36 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 22:35 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 16:57 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 14:25 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 13:23 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 11:54 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 11:22 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 02:36 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/29 00:48 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 21:24 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 16:26 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 14:39 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 14:36 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 09:28 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 05:07 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 04:01 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 01:48 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/28 00:02 linux-next 66f1e1ea3548 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 20:17 linux-next 66f1e1ea3548 bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 18:54 linux-next 66f1e1ea3548 bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 10:19 linux-next 66f1e1ea3548 bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 07:16 linux-next 2ef7141596ee bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 04:09 linux-next 2ef7141596ee bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 02:56 linux-next 2ef7141596ee bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/27 00:23 linux-next 2ef7141596ee bf285f0c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 17:48 linux-next 2ef7141596ee 23afc60f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 16:02 linux-next 2ef7141596ee 23afc60f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 13:06 linux-next 2ef7141596ee 23afc60f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 10:35 linux-next 2ef7141596ee 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 03:16 linux-next fe1998aa935b 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/26 00:57 linux-next fe1998aa935b 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/25 17:27 linux-next fe1998aa935b 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/25 15:10 linux-next fe1998aa935b 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/08 15:06 linux-next 7d730f1bf6f3 5e837c76 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
2023/10/06 18:09 linux-next 7d730f1bf6f3 ea12a918 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING: suspicious RCU usage in gfs2_permission
* Struck through repros no longer work on HEAD.