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-executor.3/456. stack backtrace: CPU: 1 PID: 456 Comm: syz-executor.3 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: __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: 0033:0x7f8e71a7b6e0 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 09 82 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 5c 82 02 00 8b 44 RSP: 002b:00007f8e7283fe70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007f8e71a7b6e0 RDX: 0000000000010000 RSI: 0000000020000080 RDI: 00000000ffffff9c RBP: 0000000020000080 R08: 0000000000000000 R09: 000000000000081d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000020000080 R13: 00007f8e7283ff40 R14: 00000000000126de R15: 0000000020000140