ceph:  [00000000-0000-0000-0000-000000000000 0] ceph_real_mount: mount start ffff888027364000
libceph:  __ceph_monc_want_map monmap epoch 0 continuous 1
libceph:  __ceph_monc_want_map osdmap epoch 0 continuous 0
------------[ cut here ]------------
kernel BUG at net/ceph/mon_client.c:211!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 14206 Comm: syz.9.2113 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:pick_new_mon net/ceph/mon_client.c:211 [inline]
RIP: 0010:__open_session+0x60f/0x740 net/ceph/mon_client.c:245
Code: f6 44 89 e7 e8 82 d7 25 fa 89 c5 e9 2b fb ff ff e8 d6 f7 7b f6 c7 83 b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 c2 f7 7b f6 90 <0f> 0b e8 5a 3f ef f6 e9 7b fa ff ff 4c 89 f7 e8 4d 3f ef f6 e9 16
RSP: 0000:ffffc90005a9fbc0 EFLAGS: 00010287
RAX: 00000000000174ac RBX: ffff88805ab94290 RCX: ffffc90028323000
RDX: 0000000000080000 RSI: ffffffff8b8fabce RDI: ffff888025fe2580
RBP: ffff888000382740 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000ffffffff R14: ffff88805ab94400 R15: ffff88805ab94298
FS:  0000000000000000(0000) GS:ffff88809594a000(0063) knlGS:00000000f5486b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7218e50 CR3: 0000000074638000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ceph_monc_open_session+0x46/0x60 net/ceph/mon_client.c:534
 __ceph_open_session+0x135/0x590 net/ceph/ceph_common.c:798
 ceph_real_mount fs/ceph/super.c:1173 [inline]
 ceph_get_tree+0xd98/0x1fd0 fs/ceph/super.c:1362
 vfs_get_tree+0x92/0x320 fs/super.c:1932
 vfs_cmd_create+0xd7/0x2a0 fs/fsopen.c:231
 vfs_fsconfig_locked fs/fsopen.c:295 [inline]
 __do_sys_fsconfig+0x55a/0xcb0 fs/fsopen.c:463
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf746efec
Code: Unable to access opcode bytes at 0xf746efc2.
RSP: 002b:00000000f548650c EFLAGS: 00000292 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pick_new_mon net/ceph/mon_client.c:211 [inline]
RIP: 0010:__open_session+0x60f/0x740 net/ceph/mon_client.c:245
Code: f6 44 89 e7 e8 82 d7 25 fa 89 c5 e9 2b fb ff ff e8 d6 f7 7b f6 c7 83 b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 c2 f7 7b f6 90 <0f> 0b e8 5a 3f ef f6 e9 7b fa ff ff 4c 89 f7 e8 4d 3f ef f6 e9 16
RSP: 0000:ffffc90005a9fbc0 EFLAGS: 00010287
RAX: 00000000000174ac RBX: ffff88805ab94290 RCX: ffffc90028323000
RDX: 0000000000080000 RSI: ffffffff8b8fabce RDI: ffff888025fe2580
RBP: ffff888000382740 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000ffffffff R14: ffff88805ab94400 R15: ffff88805ab94298
FS:  0000000000000000(0000) GS:ffff888095a4a000(0063) knlGS:00000000f5486b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5465da4 CR3: 0000000074638000 CR4: 0000000000352ef0