overlayfs: maximum fs stacking depth exceeded
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
overlayfs: filesystem on './bus' not supported as upperdir
PGD b5245067 P4D b5245067 PUD b5246067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 17659 Comm: kworker/1:3 Not tainted 4.19.152-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events cfg80211_destroy_iface_wk
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:try_to_grab_pending+0xcd/0x6f0 kernel/workqueue.c:1228
Code: 3c 02 00 0f 85 26 05 00 00 4c 89 6d 00 e8 8b 93 2a 00 31 ff 44 89 e6 e8 a1 5d 25 00 45 84 e4 0f 85 da 01 00 00 e8 63 5c 25 00 <f0> 48 0f ba 2b 00 41 0f 92 c4 31 ff 44 89 e6 e8 7f 5d 25 00 45 84
RSP: 0018:ffff8880537bf830 EFLAGS: 00010093
RAX: ffff8880aa2a65c0 RBX: 0000000000000080 RCX: ffffffff813f703f
RDX: 0000000000000000 RSI: ffffffff813f704d RDI: 0000000000000001
RBP: ffff8880537bf8a8 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000293 R14: dffffc0000000010 R15: ffff8880aa2a65c0
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000000b5244000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __cancel_work_timer+0xa6/0x590 kernel/workqueue.c:2974
 rhashtable_free_and_destroy+0x2b/0x970 lib/rhashtable.c:1145
 mesh_table_free net/mac80211/mesh_pathtbl.c:72 [inline]
 mesh_pathtbl_unregister+0x42/0x9a net/mac80211/mesh_pathtbl.c:827
 ieee80211_teardown_sdata+0x209/0x2b0 net/mac80211/iface.c:1126
 rollback_registered_many+0x927/0xe70 net/core/dev.c:8202
 rollback_registered+0xe9/0x1b0 net/core/dev.c:8230
 unregister_netdevice_queue+0x1de/0x3e0 net/core/dev.c:9292
 unregister_netdevice include/linux/netdevice.h:2614 [inline]
 ieee80211_if_remove+0x213/0x310 net/mac80211/iface.c:1919
 ieee80211_del_iface+0x12/0x20 net/mac80211/cfg.c:144
 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline]
 cfg80211_destroy_ifaces+0x1d0/0x750 net/wireless/core.c:317
 cfg80211_destroy_iface_wk+0x1a/0x20 net/wireless/core.c:329
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
CR2: 0000000000000080
---[ end trace 5db74946eb32940d ]---
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:try_to_grab_pending+0xcd/0x6f0 kernel/workqueue.c:1228
Code: 3c 02 00 0f 85 26 05 00 00 4c 89 6d 00 e8 8b 93 2a 00 31 ff 44 89 e6 e8 a1 5d 25 00 45 84 e4 0f 85 da 01 00 00 e8 63 5c 25 00 <f0> 48 0f ba 2b 00 41 0f 92 c4 31 ff 44 89 e6 e8 7f 5d 25 00 45 84
RSP: 0018:ffff8880537bf830 EFLAGS: 00010093
RAX: ffff8880aa2a65c0 RBX: 0000000000000080 RCX: ffffffff813f703f
RDX: 0000000000000000 RSI: ffffffff813f704d RDI: 0000000000000001
RBP: ffff8880537bf8a8 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000293 R14: dffffc0000000010 R15: ffff8880aa2a65c0
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000000b5244000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400