bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 with gcc (GCC) 8.4.1 20210217 kernel signature: 8335ec1c2e563d685aa94a5e293e8c09b1065727a0c47ed9729da5ceb537f6fe all runs: crashed: WARNING in __rate_control_send_low testing current HEAD cb83ddcd5332fcc3efd52ba994976efc4dd6061e testing commit cb83ddcd5332fcc3efd52ba994976efc4dd6061e with gcc (GCC) 8.4.1 20210217 kernel signature: c43e7b5024080824343ea0c40bdeec280c582538651ddb47b06769d7b9b63716 all runs: crashed: WARNING in __rate_control_send_low revisions tested: 2, total time: 21m54.671322107s (build: 15m15.675175371s, test: 6m16.431094019s) the crash still happens on HEAD commit msg: Linux 4.14.226 crash: WARNING in __rate_control_send_low IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready no supported rates (0xffffffff) in rate_mask 0x0 with flags 0x0 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 9139 at net/mac80211/rate.c:362 __rate_control_send_low.cold.6+0x56/0x78 net/mac80211/rate.c:359 Modules linked in: CPU: 1 PID: 9139 Comm: modprobe Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8881ec432000 task.stack: ffff8881e0498000 RIP: 0010:__rate_control_send_low.cold.6+0x56/0x78 net/mac80211/rate.c:359 RSP: 0000:ffff8881f6507a58 EFLAGS: 00010282 RAX: 000000000000003f RBX: 000000000000000c RCX: 0000000000000000 RDX: 000000000000003f RSI: ffffffff878b90e0 RDI: ffffed103eca0f42 RBP: ffff8881f6507ac0 R08: ffff8881ec4328f8 R09: 0000000000000000 R10: 0000000000000000 R11: dffffc0000000000 R12: ffff8881e7576428 R13: 0000000000000000 R14: 0000000000000090 R15: 000000000000000c FS: 0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f547f983c20 CR3: 00000001d9a5a003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rate_control_send_low+0x222/0x5a0 net/mac80211/rate.c:383 minstrel_ht_get_rate+0x50/0x1500 net/mac80211/rc80211_minstrel_ht.c:1045 rate_control_get_rate+0x3ac/0x5e0 net/mac80211/rate.c:910 __ieee80211_beacon_get+0x814/0x1940 net/mac80211/tx.c:4319 ieee80211_beacon_get_tim+0x7c/0x6d0 net/mac80211/tx.c:4346 ieee80211_beacon_get include/net/mac80211.h:4401 [inline] mac80211_hwsim_beacon_tx+0xd3/0x550 drivers/net/wireless/mac80211_hwsim.c:1520 __iterate_interfaces+0xd6/0x380 net/mac80211/util.c:613 ieee80211_iterate_active_interfaces_atomic+0x61/0x100 net/mac80211/util.c:649 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/mac80211_hwsim.c:1558 __tasklet_hrtimer_trampoline+0x2d/0xb0 kernel/softirq.c:618 tasklet_hi_action+0x19e/0x360 kernel/softirq.c:549 __do_softirq+0x247/0x9a2 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15f/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x149/0x5d0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x9a/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1f3/0x3e0 kernel/locking/lockdep.c:4001 RSP: 0000:ffff8881e049fa78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8881ec432000 RCX: ffff8881ec432888 RDX: 1ffffffff11e10a1 RSI: ffff8881ec432900 RDI: 0000000000000286 RBP: ffff8881e049fac0 R08: ffff8881ec432920 R09: 0000000000000000 R10: 0000000000000078 R11: ffff8881ec432000 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] lock_page_memcg+0x39/0x260 mm/memcontrol.c:1640 page_add_file_rmap+0x22/0x770 mm/rmap.c:1180 alloc_set_pte+0x2c6/0x13e0 mm/memory.c:3541 filemap_map_pages+0x52b/0xe10 mm/filemap.c:2589 do_fault_around mm/memory.c:3687 [inline] do_read_fault mm/memory.c:3721 [inline] do_fault mm/memory.c:3852 [inline] handle_pte_fault mm/memory.c:4082 [inline] __handle_mm_fault+0x2228/0x3e40 mm/memory.c:4206 handle_mm_fault+0x32d/0x790 mm/memory.c:4243 __do_page_fault+0x4c3/0xa90 arch/x86/mm/fault.c:1442 do_page_fault+0x64/0x400 arch/x86/mm/fault.c:1517 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0033:0x7f547f983c20 RSP: 002b:00007ffc39b71130 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: 89 f8 83 e0 07 83 c0 03 38 c8 7c 04 84 c9 75 26 8b 04 9a 8b 55 d0 44 89 e9 89 c6 48 c7 c7 40 0e 6a 88 4c 89 4d c8 e8 11 d3 e3 ff <0f> 0b 4c 8b 4d c8 e9 86 1f 97 ff 48 89 55 c0 4c 89 4d c8 e8 85 ---[ end trace 68b317e3260b2304 ]--- IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready 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: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready