bisecting fixing commit since f40ddce88593482919761f74910f42f4b84c004b building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217 kernel signature: a20fdda6284e1de4805076b3f724e927513bee772a53c4f27dc22d1ef7831f86 run #0: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #1: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #2: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #3: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #4: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #5: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #6: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #7: crashed: INFO: rcu detected stall in addrconf_rs_timer run #8: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #9: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #10: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #11: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #12: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #13: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #14: crashed: BUG: soft lockup in addrconf_rs_timer run #15: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #16: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor966472538" "root@10.128.1.28:./syz-executor966472538"]: exit status 1 ssh: connect to host 10.128.1.28 port 22: Connection timed out lost connection run #17: OK run #18: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #19: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon testing current HEAD 7426cedc7dad67bf3c71ea6cc29ab7822e1a453f testing commit 7426cedc7dad67bf3c71ea6cc29ab7822e1a453f with gcc (GCC) 10.2.1 20210217 kernel signature: 2629dd019e80562e59b99d353abd8f3848368056db28b901b0e296e549741fd4 run #0: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #1: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #2: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #3: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #4: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #5: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #6: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #7: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #8: OK run #9: crashed: BUG: soft lockup in mac80211_hwsim_beacon revisions tested: 2, total time: 38m30.09831048s (build: 14m53.301540967s, test: 22m50.17881227s) the crash still happens on HEAD commit msg: Merge tag 'spi-fix-v5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi crash: BUG: soft lockup in mac80211_hwsim_beacon watchdog: BUG: soft lockup - CPU#0 stuck for 118s! [syz-executor772:19496] Modules linked in: irq event stamp: 19594007 hardirqs last enabled at (19594006): [] asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:673 hardirqs last disabled at (19594007): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (10394402): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last enabled at (10394402): [] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 softirqs last disabled at (10394405): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last disabled at (10394405): [] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 CPU: 0 PID: 19496 Comm: syz-executor772 Not tainted 5.13.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffffc90000007800 EFLAGS: 00000217 RAX: 1ffffffff18cf19c RBX: ffffffff8c678ce4 RCX: ffffffff815b2126 RDX: 0000000000000000 RSI: ffffffff8cd772aa RDI: ffffffff8c678ce4 RBP: ffffffff8c678ce4 R08: 0000000000000000 R09: ffffffff8cd772aa R10: fffff52000000f2f R11: 0000000000078087 R12: ffffffff8c678ce4 R13: ffffffff8c678ce4 R14: ffffffff8c678ce4 R15: dffffc0000000000 FS: 0000000000516300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004b6110 CR3: 000000002249c000 CR4: 0000000000350ef0 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x32a/0x1ce0 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1583 [inline] slab_free_freelist_hook+0xa1/0x180 mm/slub.c:1608 slab_free mm/slub.c:3168 [inline] kfree+0xdb/0x3c0 mm/slub.c:4212 skb_release_all net/core/skbuff.c:726 [inline] __kfree_skb net/core/skbuff.c:740 [inline] consume_skb net/core/skbuff.c:896 [inline] consume_skb+0x94/0xf0 net/core/skbuff.c:890 mac80211_hwsim_beacon_tx+0x3f8/0x7c0 drivers/net/wireless/mac80211_hwsim.c:1834 __iterate_interfaces+0x107/0x360 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x5c/0xf0 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xb7/0x160 drivers/net/wireless/mac80211_hwsim.c:1857 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:preempt_count_sub+0x14/0x150 kernel/sched/core.c:4826 Code: 89 df e8 7f 29 5e 00 eb 90 e8 78 29 5e 00 eb ac 66 0f 1f 44 00 00 48 c7 c0 e0 06 7a 8e 53 89 fb 48 ba 00 00 00 00 00 fc ff df <48> 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 RSP: 0018:ffffc90002857bd8 EFLAGS: 00000202 RAX: ffffffff8e7a06e0 RBX: 0000000000000001 RCX: 1ffffffff1c90f72 RDX: dffffc0000000000 RSI: ffffffff88aaff60 RDI: 0000000000000001 RBP: ffff888015926da8 R08: 0000000000000001 R09: ffffffff8e413997 R10: 0000000000000001 R11: ffff8881411026a0 R12: ffff8880118f8000 R13: ffff888015926d01 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x2a/0x40 kernel/locking/spinlock.c:199 rwsem_down_write_slowpath+0x754/0x1200 kernel/locking/rwsem.c:1087 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:774 [inline] perf_fasync+0x64/0xb0 kernel/events/core.c:6346 __fput+0x579/0x870 fs/file_table.c:277 task_work_run+0xc0/0x160 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x281/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x403343 Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 RSP: 002b:00007ffff2243918 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000403343 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000031 R09: 0000000000000031 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000067e74 R13: 00007ffff2243970 R14: 00007ffff2243960 R15: 00007ffff2243934 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19498 Comm: syz-executor772 Not tainted 5.13.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_lock+0x5e/0x1840 kernel/locking/lockdep.c:4441 Code: 48 c7 44 24 38 20 32 1b 8a 48 8d 04 13 48 c7 44 24 40 a0 86 51 81 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 00 f2 f2 f2 40 10 00 00 00 f3 c7 40 14 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 RSP: 0018:ffffc90000db0398 EFLAGS: 00000012 RAX: fffff520001b6079 RBX: 1ffff920001b6079 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880118fc170 RDI: ffff8880118fb780 RBP: ffff8880118fc192 R08: dffffc0000000000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880118fb780 R14: 0000000000000002 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f92c770a198 CR3: 0000000040896000 CR4: 0000000000350ee0 Call Trace: mark_usage kernel/locking/lockdep.c:4372 [inline] __lock_acquire+0x141d/0x5560 kernel/locking/lockdep.c:4856 lock_acquire kernel/locking/lockdep.c:5512 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5477 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 hrtimer_interrupt+0x3d0/0x920 kernel/time/hrtimer.c:1694 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:418 [inline] RIP: 0010:__rcu_read_lock+0x26/0xa0 kernel/rcu/tree_plugin.h:438 Code: 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 00 f0 01 00 48 8d bb cc 03 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 83 83 cc 03 00 RSP: 0018:ffffc90000db08c8 EFLAGS: 00000217 RAX: dffffc0000000000 RBX: ffff8880118fb780 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88fc5160 RDI: ffff8880118fbb4c RBP: 00000000004419f9 R08: ffffffff8d6c916e R09: 0000000000000001 R10: fffff520001b6131 R11: 0000000000078087 R12: ffffc90000db09e8 R13: 0000000000000000 R14: ffff8880118fb780 R15: ffff8880102ecdc0 rcu_read_lock include/linux/rcupdate.h:655 [inline] is_bpf_text_address+0xb/0xe0 kernel/bpf/core.c:704 kernel_text_address kernel/extable.c:151 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1583 [inline] slab_free_freelist_hook+0xa1/0x180 mm/slub.c:1608 slab_free mm/slub.c:3168 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3184 mac80211_hwsim_beacon_tx+0x3f8/0x7c0 drivers/net/wireless/mac80211_hwsim.c:1834 __iterate_interfaces+0x107/0x360 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x5c/0xf0 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xb7/0x160 drivers/net/wireless/mac80211_hwsim.c:1857 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5535 Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 f2 1a ff f8 e8 6d 8f 26 f9 fb bf 01 00 00 00 b2 ce ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 40 09 ff RSP: 0018:ffffc900027df488 EFLAGS: 00000202 RAX: 000000000000ca01 RBX: ffff8880118fb780 RCX: 1ffffffff1c8408a RDX: 0000000000000000 RSI: ffffffff88aaff60 RDI: 0000000000000001 RBP: ffffed100231f6f0 R08: 0000000000000001 R09: ffffffff8e413887 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x31/0x80 kernel/entry/common.c:427 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:stack_trace_consume_entry+0xd3/0x160 kernel/stacktrace.c:92 Code: 02 00 0f 85 92 00 00 00 8d 45 01 89 43 10 48 8b 03 48 8d 2c e8 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 <75> 5c 48 89 75 00 8b 43 08 39 43 10 0f 92 c0 48 83 c4 08 5b 5d c3 RSP: 0018:ffffc900027df558 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc900027df630 RCX: 0000000000000000 RDX: 1ffff920004fbed9 RSI: ffffffff81a489f2 RDI: ffffc900027df63c RBP: ffffc900027df6c8 R08: ffffffff8cde8e3c R09: 0000000000000001 R10: fffff520004fbeba R11: 0000000000078087 R12: ffffc900027df630 R13: 0000000000000000 R14: ffff8880118fb780 R15: ffff88800f077dc0 arch_stack_walk+0x6d/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1583 [inline] slab_free_freelist_hook+0xa1/0x180 mm/slub.c:1608 slab_free mm/slub.c:3168 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3184 anon_vma_chain_free mm/rmap.c:141 [inline] unlink_anon_vmas+0x149/0x7d0 mm/rmap.c:414 free_pgtables+0xbe/0x2b0 mm/memory.c:413 exit_mmap+0x24b/0x4b0 mm/mmap.c:3209 __mmput+0xeb/0x3e0 kernel/fork.c:1096 exit_mm kernel/exit.c:502 [inline] do_exit+0x98e/0x2500 kernel/exit.c:813 do_group_exit+0xe7/0x290 kernel/exit.c:923 get_signal+0x3b2/0x1c60 kernel/signal.c:2835 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 Lost 19 message(s)!