syzbot has found a reproducer for the following crash on: HEAD commit: 90568ecf Merge tag 'kvm-5.6-2' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b26831e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=69fa012479f9a62 dashboard link: https://syzkaller.appspot.com/bug?extid=98704a51af8e3d9425a9 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172182b5e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1590aab5e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+98704a51af8e3d9425a9@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: sleeping function called from invalid context at mm/slab.h:565 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8873, name: syz-executor545 1 lock held by syz-executor545/8873: #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: [<ffffffff81be818c>] spin_lock include/linux/spinlock.h:338 [inline] [<ffffffff81be818c>] sget_fc+0xdc/0x640 fs/super.c:521 CPU: 1 PID: 8873 Comm: syz-executor545 Not tainted 5.5.0-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:495 compare_mount_options fs/ceph/super.c:553 [inline] ceph_compare_super+0x1d4/0x560 fs/ceph/super.c:1052 sget_fc+0x139/0x640 fs/super.c:524 ceph_get_tree+0x467/0x1540 fs/ceph/super.c:1127 vfs_get_tree+0x8b/0x2a0 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x18ee/0x25a0 fs/namespace.c:3142 __do_sys_mount fs/namespace.c:3351 [inline] __se_sys_mount+0xdd/0x110 fs/namespace.c:3328 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3328 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441289 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe85f476d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441289 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 00000000006cb018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402000 R13: 0000000000402090 R14: 0000000000000000 R15: 0000000000000000 ceph: No mds server is up or the cluster is laggy
