Hello, syzbot found the following issue on: HEAD commit: d93a0d43 Merge tag 'block-5.12-2021-04-02' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12d81cfcd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=71a75beb62b62a34 dashboard link: https://syzkaller.appspot.com/bug?extid=860268315ba86ea6b96b compiler: Debian clang version 11.0.1-2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+860268315ba86ea6b96b@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline] BUG: KASAN: null-ptr-deref in try_to_grab_pending+0xee/0xa50 kernel/workqueue.c:1257 Write of size 8 at addr 0000000000000088 by task kworker/0:3/4787 CPU: 0 PID: 4787 Comm: kworker/0:3 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events cfg80211_destroy_iface_wk Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 __kasan_report mm/kasan/report.c:403 [inline] kasan_report+0x152/0x200 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:186 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline] try_to_grab_pending+0xee/0xa50 kernel/workqueue.c:1257 __cancel_work_timer+0x81/0x5b0 kernel/workqueue.c:3098 rhashtable_free_and_destroy+0x25/0x8b0 lib/rhashtable.c:1137 mesh_table_free net/mac80211/mesh_pathtbl.c:70 [inline] mesh_pathtbl_unregister+0x4b/0xa0 net/mac80211/mesh_pathtbl.c:812 unregister_netdevice_many+0x12ea/0x18e0 net/core/dev.c:10951 unregister_netdevice_queue+0x2a9/0x300 net/core/dev.c:10868 unregister_netdevice include/linux/netdevice.h:2884 [inline] _cfg80211_unregister_wdev+0x17b/0x5b0 net/wireless/core.c:1127 ieee80211_if_remove+0x1cc/0x250 net/mac80211/iface.c:2020 ieee80211_del_iface+0x12/0x20 net/mac80211/cfg.c:144 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline] cfg80211_destroy_ifaces+0x182/0x250 net/wireless/core.c:341 cfg80211_destroy_iface_wk+0x30/0x40 net/wireless/core.c:354 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
