BUG: sleeping function called from invalid context at mm/slab.h:565 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 23618, name: syz-executor.1 1 lock held by syz-executor.1/23618: #0: ffffffff89310218 (sb_lock){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #0: ffffffff89310218 (sb_lock){+.+.}, at: sget_fc+0xdc/0x640 fs/super.c:521 Preemption disabled at: [] spin_lock include/linux/spinlock.h:338 [inline] [] sget_fc+0xdc/0x640 fs/super.c:521 CPU: 0 PID: 23618 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 ___might_sleep+0x449/0x5e0 kernel/sched/core.c:6800 __might_sleep+0x8f/0x100 kernel/sched/core.c:6753 slab_pre_alloc_hook mm/slab.h:565 [inline] slab_alloc mm/slab.c:3306 [inline] __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x6f/0x340 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] path_remove_extra_slash+0xae/0x2a0 fs/ceph/super.c:489 compare_mount_options fs/ceph/super.c:547 [inline] ceph_compare_super+0x1d4/0x560 fs/ceph/super.c:1046 sget_fc+0x139/0x640 fs/super.c:524 ceph_get_tree+0x4ad/0x1580 fs/ceph/super.c:1121 vfs_get_tree+0x8b/0x2a0 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x18ee/0x25a0 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount+0xdd/0x110 fs/namespace.c:3293 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3293 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6c9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f39ffcbfc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f39ffcc06d4 RCX: 000000000045c6c9 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000340 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000745 R14: 00000000004c9f6e R15: 000000000076bf2c ceph: No mds server is up or the cluster is laggy