------------[ cut here ]------------
kernel BUG at net/ceph/mon_client.c:211!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 8284 Comm: syz.4.562 Not tainted syzkaller #0 PREEMPT(full) 
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 72 1e 27 fa 89 c5 e9 2b fb ff ff e8 96 4b 7e f6 c7 83 b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 82 4b 7e f6 90 <0f> 0b e8 9a 86 f1 f6 e9 7b fa ff ff 4c 89 f7 e8 8d 86 f1 f6 e9 16
RSP: 0018:ffffc90003127be0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802c090290 RCX: 0000000000000000
RDX: ffff888056640000 RSI: ffffffff8b8dca8e RDI: ffff888056640000
RBP: ffff888063f9c980 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000ffffffff R14: ffff88802c090400 R15: ffff88802c090298
FS:  00007f77461d56c0(0000) GS:ffff8880d5b5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7746192ff8 CR3: 00000001140c0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000046
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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:1947
 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_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7747f9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f77461d5028 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f7748226180 RCX: 00007f7747f9e159
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007f774803503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7748226218 R14: 00007f7748226180 R15: 00007ffc0afbf768
 </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 72 1e 27 fa 89 c5 e9 2b fb ff ff e8 96 4b 7e f6 c7 83 b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 82 4b 7e f6 90 <0f> 0b e8 9a 86 f1 f6 e9 7b fa ff ff 4c 89 f7 e8 8d 86 f1 f6 e9 16
RSP: 0018:ffffc90003127be0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802c090290 RCX: 0000000000000000
RDX: ffff888056640000 RSI: ffffffff8b8dca8e RDI: ffff888056640000
RBP: ffff888063f9c980 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000ffffffff R14: ffff88802c090400 R15: ffff88802c090298
FS:  00007f77461d56c0(0000) GS:ffff8880d5b5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7746192ff8 CR3: 00000001140c0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000046
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400