------------[ cut here ]------------
kernel BUG at net/ceph/mon_client.c:211!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 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+0x799/0x940 net/ceph/mon_client.c:245
Code: ca fd ff ff 44 89 e1 80 e1 07 38 c1 0f 8c d0 fd ff ff be 04 00 00 00 4c 89 e7 e8 e2 df 94 f6 e9 be fd ff ff e8 38 5f 22 f6 90 <0f> 0b 4d 89 ee 48 8b 04 24 42 0f b6 04 38 84 c0 0f 85 2f 01 00 00
RSP: 0018:ffffc9000e5b7ae8 EFLAGS: 00010287
RAX: ffffffff8ba5c248 RBX: ffff888041da8290 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000030a2 RDI: 00000000000030a3
RBP: 00000000ffffffff R08: ffff888036e32580 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: ffff888041da8400 R14: ffff888041da8298 R15: dffffc0000000000
FS:  00007f445446f6c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f445446eff8 CR3: 0000000041a88000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ceph_monc_open_session+0x56/0x1a0 net/ceph/mon_client.c:534
 __ceph_open_session+0x16d/0x5e0 net/ceph/ceph_common.c:798
 ceph_real_mount fs/ceph/super.c:1173 [inline]
 ceph_get_tree+0xaef/0x1a40 fs/ceph/super.c:1362
 vfs_get_tree+0x92/0x2a0 fs/super.c:1932
 vfs_cmd_create+0xa2/0x200 fs/fsopen.c:231
 __do_sys_fsconfig fs/fsopen.c:463 [inline]
 __se_sys_fsconfig+0x6b9/0x810 fs/fsopen.c:350
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f445359e559
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:00007f445446efe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f4453826090 RCX: 00007f445359e559
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f44536358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4453826128 R14: 00007f4453826090 R15: 00007ffeefca2608
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pick_new_mon net/ceph/mon_client.c:211 [inline]
RIP: 0010:__open_session+0x799/0x940 net/ceph/mon_client.c:245
Code: ca fd ff ff 44 89 e1 80 e1 07 38 c1 0f 8c d0 fd ff ff be 04 00 00 00 4c 89 e7 e8 e2 df 94 f6 e9 be fd ff ff e8 38 5f 22 f6 90 <0f> 0b 4d 89 ee 48 8b 04 24 42 0f b6 04 38 84 c0 0f 85 2f 01 00 00
RSP: 0018:ffffc9000e5b7ae8 EFLAGS: 00010287
RAX: ffffffff8ba5c248 RBX: ffff888041da8290 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000030a2 RDI: 00000000000030a3
RBP: 00000000ffffffff R08: ffff888036e32580 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: ffff888041da8400 R14: ffff888041da8298 R15: dffffc0000000000
FS:  00007f445446f6c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f445446eff8 CR3: 0000000041a88000 CR4: 0000000000352ef0