BUG: sleeping function called from invalid context in sta_info_move_state

syzbot
2020-11-03T17:43:36Z

Hello,

syzbot found the following issue on:

HEAD commit: 04a55c94 Merge tag 'mac80211-for-net-2020-10-30' of git://..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=12079c3a500000
kernel config: https://syzkaller.appspot.com/x/.config?x=803dd96a0e492ac1
dashboard link: https://syzkaller.appspot.com/bug?extid=d5a9416c6cafe53b5dd0
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13714d8a500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155a5792500000

The issue was bisected to:

commit dcd479e10a0510522a5d88b29b8f79ea3467d501
Author: Johannes Berg <johannes.berg@intel.com>
Date: Fri Oct 9 12:17:11 2020 +0000

mac80211: always wind down STA state

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d3158a500000
final oops: https://syzkaller.appspot.com/x/report.txt?x=11d3158a500000
console output: https://syzkaller.appspot.com/x/log.txt?x=16d3158a500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d5a9416c6cafe53b5dd0@syzkaller.appspotmail.com
Fixes: dcd479e10a05 ("mac80211: always wind down STA state")

wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
BUG: sleeping function called from invalid context at net/mac80211/sta_info.c:1962
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 8, name: kworker/u4:0
4 locks held by kworker/u4:0/8:
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc90000cd7da8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff888024610d00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff888024610d00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683
#3: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: sta_info_insert_finish net/mac80211/sta_info.c:644 [inline]
#3: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: sta_info_insert_rcu+0x680/0x2ba0 net/mac80211/sta_info.c:732
Preemption disabled at:
[<ffffffff88e616bf>] __mutex_lock_common kernel/locking/mutex.c:955 [inline]
[<ffffffff88e616bf>] __mutex_lock+0x10f/0x10e0 kernel/locking/mutex.c:1103
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy4 ieee80211_iface_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
___might_sleep.cold+0x1e8/0x22e kernel/sched/core.c:7298
sta_info_move_state+0x32/0x8d0 net/mac80211/sta_info.c:1962
sta_info_free+0x65/0x3b0 net/mac80211/sta_info.c:274
sta_info_insert_rcu+0x303/0x2ba0 net/mac80211/sta_info.c:738
ieee80211_ibss_finish_sta+0x212/0x390 net/mac80211/ibss.c:592
ieee80211_ibss_work+0x2c7/0xe80 net/mac80211/ibss.c:1700
ieee80211_iface_work+0x82e/0x970 net/mac80211/iface.c:1476
process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

=============================
[ BUG: Invalid wait context ]
5.10.0-rc1-syzkaller #0 Tainted: G W
-----------------------------
kworker/u4:0/8 is trying to lock:
ffff88801bb429d0 (&local->chanctx_mtx){+.+.}-{3:3}, at: ieee80211_recalc_min_chandef+0x49/0x140 net/mac80211/util.c:2740
other info that might help us debug this:
context-{4:4}
4 locks held by kworker/u4:0/8:
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88801b994138 ((wq_completion)phy4){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc90000cd7da8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff888024610d00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff888024610d00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683
#3: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: sta_info_insert_finish net/mac80211/sta_info.c:644 [inline]
#3: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: sta_info_insert_rcu+0x680/0x2ba0 net/mac80211/sta_info.c:732
stack backtrace:
CPU: 0 PID: 8 Comm: kworker/u4:0 Tainted: G W 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy4 ieee80211_iface_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
print_lock_invalid_wait_context kernel/locking/lockdep.c:4489 [inline]
check_wait_context kernel/locking/lockdep.c:4550 [inline]
__lock_acquire.cold+0x310/0x3a2 kernel/locking/lockdep.c:4787
lock_acquire kernel/locking/lockdep.c:5442 [inline]
lock_acquire+0x1af/0x8b0 kernel/locking/lockdep.c:5407
__mutex_lock_common kernel/locking/mutex.c:956 [inline]
__mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
ieee80211_recalc_min_chandef+0x49/0x140 net/mac80211/util.c:2740
sta_info_move_state+0x3cf/0x8d0 net/mac80211/sta_info.c:2019
sta_info_free+0x65/0x3b0 net/mac80211/sta_info.c:274
sta_info_insert_rcu+0x303/0x2ba0 net/mac80211/sta_info.c:738
ieee80211_ibss_finish_sta+0x212/0x390 net/mac80211/ibss.c:592
ieee80211_ibss_work+0x2c7/0xe80 net/mac80211/ibss.c:1700
ieee80211_iface_work+0x82e/0x970 net/mac80211/iface.c:1476
process_one_work+0x933/0x15a0 kernel/workqueue.c:2272

---
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@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see: