watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.2:23176] Modules linked in: irq event stamp: 2438989 hardirqs last enabled at (2438988): [] kmem_cache_free+0x109/0x260 mm/slab.c:3766 hardirqs last disabled at (2438989): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2431834): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2431837): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2431837): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 23176 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kmem_cache_free+0x11c/0x260 mm/slab.c:3766 Code: 11 48 63 75 74 48 89 df e8 51 21 df 01 e9 68 ff ff ff e8 a7 80 cf ff 48 83 3d e7 59 59 08 00 0f 84 f8 00 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 eb 86 65 8b 05 76 58 69 7e 83 f8 07 0f 87 e7 00 00 RSP: 0018:ffff8880ba007d20 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff88809d18f040 RCX: 1ffff1101550bd35 RDX: 0000000000000000 RSI: ffff8880aa85e9d8 RDI: 0000000000000286 RBP: ffff8880b5b96900 R08: 0000000000400000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: ffffffff866fedf1 R14: 0000000000000000 R15: ffff88808d64cde0 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd4c10eb60 CR3: 0000000090c29000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] consume_skb+0x120/0x3d0 net/core/skbuff.c:714 mac80211_hwsim_tx_frame+0x133/0x210 drivers/net/wireless/mac80211_hwsim.c:1557 mac80211_hwsim_beacon_tx+0x3f8/0x680 drivers/net/wireless/mac80211_hwsim.c:1595 __iterate_interfaces+0x2e1/0x4a0 net/mac80211/util.c:614 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:650 mac80211_hwsim_beacon+0xc9/0x190 drivers/net/wireless/mac80211_hwsim.c:1615 __tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_atomic_add_negative arch/x86/include/asm/atomic.h:154 [inline] RIP: 0010:atomic_add_negative include/asm-generic/atomic-instrumented.h:398 [inline] RIP: 0010:page_remove_file_rmap+0x99/0xa30 mm/rmap.c:1232 Code: c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f e9 e0 14 0f 00 e8 3b d4 d2 ff 49 8d 7e 30 be 04 00 00 00 e8 ad 9d 08 00 f0 41 83 46 30 ff <0f> 98 c3 31 ff 89 de e8 4b d5 d2 ff 84 db 74 bc 41 bd ff ff ff ff RSP: 0018:ffff88808c747700 EFLAGS: 00000257 ORIG_RAX: ffffffffffffff13 RAX: fffff940002736bf RBX: 0000000000000000 RCX: ffffffff818fb143 RDX: fffff940002736bf RSI: 0000000000000004 RDI: ffffea000139b5f0 RBP: ffffea000139b5c0 R08: 0000000000000001 R09: fffff940002736be R10: ffffea000139b5f3 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffea000139b5c0 R15: 00007f8b2d7d7000 page_remove_rmap+0xe5/0x120 mm/rmap.c:1297 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x147d/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8b2e4c02d1 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007f8b2ce0f0b0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: fffffffffffffdfc RBX: 00007f8b2e5bcf80 RCX: 00007f8b2e4c02d1 RDX: 00007f8b2ce0f0f0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f8b2e4f6580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fffd1a0da0f R14: 00007f8b2ce0f300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8086 Comm: syz-fuzzer Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0033:0x41eb3c Code: 30 77 14 4c 8b 57 48 47 0f b6 14 02 66 90 45 84 e2 0f 84 40 01 00 00 41 0f b6 14 10 41 84 d4 0f 85 9a 00 00 00 90 f0 45 08 21 <48> 8b 15 75 c6 b0 01 84 02 90 90 48 8b 4f 18 90 49 b8 00 00 00 00 RSP: 002b:00007ffd4c10e9d8 EFLAGS: 00000286 RAX: 000000c028140cf0 RBX: 000000c028148340 RCX: 0000000000000005 RDX: 00000000000000d0 RSI: 000000c00003f698 RDI: 00007f4a0ccd2708 RBP: 00007ffd4c10ea18 R08: 0000000000000008 R09: 00007f4a041eb990 R10: 0000000000000045 R11: 0000000000000018 R12: 0000000000000020 R13: 000000c028140cf0 R14: 0000000001f01ec0 R15: 00007f4a0d863b3e FS: 0000000001f02330 GS: 0000000000000000