bisecting fixing commit since b94de4d19498b454645b72d08a05d32fa9074fb5 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit b94de4d19498b454645b72d08a05d32fa9074fb5 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d454a62a068dcfc21fabf1ca43eed24e106979a53c227d70d1bd7277c50ac4dc all runs: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio testing current HEAD e23d55af0e1fca9be5c99f0c37d48b289f4d6489 testing commit e23d55af0e1fca9be5c99f0c37d48b289f4d6489 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 55102619f93dc01d2daaab01f88c5ccd60bb6e0c5358cd84729d98824b0055be all runs: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio revisions tested: 2, total time: 29m41.181887426s (build: 22m32.929047276s, test: 6m23.251469367s) the crash still happens on HEAD commit msg: Linux 4.19.205 crash: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio CPU: 0 PID: 9202 Comm: syz-executor.3 Not tainted 4.19.205-syzkaller #0 ================================================================== Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 BUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x1f2/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:178 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 Read of size 8 at addr ffff8881eced7880 by task syz-executor.2/9183 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x20 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2b5/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kvm_io_bus_unregister_dev+0x116/0x2f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3886 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007eff926e0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007eff926e01d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcb37dbccf R14: 00007eff926e0300 R15: 0000000000022000 CPU: 1 PID: 9183 Comm: syz-executor.2 Not tainted 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 kvm_vm_ioctl_unregister_coalesced_mmio+0x1f2/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:178 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc52f927188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007fc52f9271d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff689e6d6f R14: 00007fc52f927300 R15: 0000000000022000 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 Allocated by task 9183: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 kmem_cache_alloc_trace+0x152/0x3a0 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] kvm_vm_ioctl_register_coalesced_mmio+0x4f/0x320 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:146 kvm_vm_ioctl+0xa0e/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3266 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9183: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 coalesced_mmio_destructor+0x100/0x150 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:101 kvm_iodevice_destructor include/kvm/iodev.h:73 [inline] kvm_io_bus_unregister_dev.cold.38+0xbd/0x10e arch/x86/kvm/../../../virt/kvm/kvm_main.c:3898 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 kvm: failed to shrink bus, removing it completely ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881eced7880 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8881eced7880, ffff8881eced78c0) The buggy address belongs to the page: page:ffffea0007b3b5c0 count:1 mapcount:0 mapping:ffff8881f6000340 index:0x0 flags: 0x17ff00000000100(slab) raw: 017ff00000000100 ffffea0007b26d08 ffffea0007b10408 ffff8881f6000340 raw: 0000000000000000 ffff8881eced7000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881eced7780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881eced7800: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8881eced7880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ list_del corruption, ffff8881ec914880->prev is LIST_POISON2 (dead000000000200) ffff8881eced7900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881eced7980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 ieee80211 phy12: Selected rate control algorithm 'minstrel_ht' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready CPU: 1 PID: 9211 Comm: syz-executor.4 Tainted: G B 4.19.205-syzkaller #0 ieee80211 phy13: Selected rate control algorithm 'minstrel_ht' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:50! IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x20 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2b5/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kvm_io_bus_unregister_dev+0x116/0x2f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3886 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1fc6fc7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007f1fc6fc71d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe92a2043f R14: 00007f1fc6fc7300 R15: 0000000000022000 wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 invalid opcode: 0000 [#1] PREEMPT SMP KASAN wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 CPU: 0 PID: 9202 Comm: syz-executor.3 Tainted: G B 4.19.205-syzkaller #0 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x4a lib/list_debug.c:48 Code: f7 ff 0f 0b 48 89 f1 48 c7 c7 a0 23 50 88 48 89 de e8 7c fb f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 24 50 88 e8 68 fb f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 80 24 50 88 e8 54 fb f7 ff 0f 0b RSP: 0018:ffff8881f3737958 EFLAGS: 00010282 RAX: 000000000000004e RBX: ffff8881ec914880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff885021e0 RDI: ffffffff8bad8720 RBP: ffff8881f3737970 R08: ffffed103ec84ea9 R09: ffffed103ec84ea8 R10: ffffed103ec84ea8 R11: ffff8881f6427547 R12: dead000000000200 R13: ffff8881ec914900 R14: ffff8881ec914900 R15: dffffc0000000000 FS: 00007eff926e0700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fadfb5c6740 CR3: 00000001eed73001 CR4: 00000000001626f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 Call Trace: IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] coalesced_mmio_destructor+0x1a/0x150 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:99 kvm_iodevice_destructor include/kvm/iodev.h:73 [inline] kvm_vm_ioctl_unregister_coalesced_mmio+0x199/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:181 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready CPU: 1 PID: 9242 Comm: syz-executor.0 Tainted: G B 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 should_failslab+0x9/0x20 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2b5/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kvm_io_bus_unregister_dev+0x116/0x2f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3886 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007eff926e0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007eff926e01d0 R08: 0000000000000000 R09: 0000000000000000 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcb37dbccf R14: 00007eff926e0300 R15: 0000000000022000 Modules linked in: list_del corruption, ffff8881eced7880->prev is LIST_POISON2 (dead000000000200) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:50! ksys_ioctl+0x62/0x90 fs/ioctl.c:705 invalid opcode: 0000 [#2] PREEMPT SMP KASAN CPU: 0 PID: 9183 Comm: syz-executor.2 Tainted: G B D 4.19.205-syzkaller #0 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x4a lib/list_debug.c:48 entry_SYSCALL_64_after_hwframe+0x49/0xbe Code: f7 ff 0f 0b 48 89 f1 48 c7 c7 a0 23 50 88 48 89 de e8 7c fb f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 24 50 88 e8 68 fb f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 80 24 50 88 e8 54 fb f7 ff 0f 0b RIP: 0033:0x465889 RSP: 0018:ffff8881d7757958 EFLAGS: 00010282 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RAX: 000000000000004e RBX: ffff8881eced7880 RCX: 0000000000000000 RSP: 002b:00007f4b6e010188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RDX: 0000000000000000 RSI: ffffffff885021e0 RDI: ffffffff8bad8720 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RBP: ffff8881d7757970 R08: ffffed103ec84ea9 R09: ffffed103ec84ea8 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 R10: ffffed103ec84ea8 R11: ffff8881f6427547 R12: dead000000000200 RBP: 00007f4b6e0101d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: ffff8881eced7900 R14: ffff8881eced7900 R15: dffffc0000000000 R13: 00007ffc37bb281f R14: 00007f4b6e010300 R15: 0000000000022000 FS: 00007fc52f927700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 kvm: failed to shrink bus, removing it completely CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CR2: 00007ffdcd2c0318 CR3: 00000001d39e2001 CR4: 00000000001626f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] coalesced_mmio_destructor+0x1a/0x150 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:99 kvm_iodevice_destructor include/kvm/iodev.h:73 [inline] kvm_vm_ioctl_unregister_coalesced_mmio+0x199/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:181 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 CPU: 1 PID: 9268 Comm: syz-executor.4 Tainted: G B D 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x20 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2b5/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kvm_io_bus_unregister_dev+0x116/0x2f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3886 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc52f927188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007fc52f9271d0 R08: 0000000000000000 R09: 0000000000000000 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff689e6d6f R14: 00007fc52f927300 R15: 0000000000022000 Modules linked in: ---[ end trace 123e0bd66631b47b ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x4a lib/list_debug.c:48 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 Code: f7 ff 0f 0b 48 89 f1 48 c7 c7 a0 23 50 88 48 89 de e8 7c fb f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 24 50 88 e8 68 fb f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 80 24 50 88 e8 54 fb f7 ff 0f 0b __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 RSP: 0018:ffff8881f3737958 EFLAGS: 00010282 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1fc6fc7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 000000000000004e RBX: ffff8881ec914880 RCX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007f1fc6fc71d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe92a2043f R14: 00007f1fc6fc7300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 ieee80211 phy14: Selected rate control algorithm 'minstrel_ht' CPU: 1 PID: 9273 Comm: syz-executor.1 Tainted: G B D 4.19.205-syzkaller #0 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 RDX: 0000000000000000 RSI: ffffffff885021e0 RDI: ffffffff8bad8720 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x20 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2b5/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kvm_io_bus_unregister_dev+0x116/0x2f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3886 kvm_vm_ioctl_unregister_coalesced_mmio+0x15b/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180 kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f214aea3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007f214aea31d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd64ee263f R14: 00007f214aea3300 R15: 0000000000022000 kvm: failed to shrink bus, removing it completely ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' kvm: failed to shrink bus, removing it completely wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 list_del corruption, ffff8881e8df4380->prev is LIST_POISON2 (dead000000000200) IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready list_del corruption, ffff8881d11a1200->prev is LIST_POISON2 (dead000000000200) wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready kernel BUG at lib/list_debug.c:50! wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 RBP: ffff8881f3737970 R08: ffffed103ec84ea9 R09: ffffed103ec84ea8 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 R10: ffffed103ec84ea8 R11: ffff8881f6427547 R12: dead000000000200 ------------[ cut here ]------------ R13: ffff8881ec914900 R14: ffff8881ec914900 R15: dffffc0000000000 kernel BUG at lib/list_debug.c:50! invalid opcode: 0000 [#3] PREEMPT SMP KASAN FS: 00007eff926e0700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CPU: 1 PID: 9273 Comm: syz-executor.1 Tainted: G B D 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x4a lib/list_debug.c:48 Code: f7 ff 0f 0b 48 89 f1 48 c7 c7 a0 23 50 88 48 89 de e8 7c fb f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 24 50 88 e8 68 fb f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 80 24 50 88 e8 54 fb f7 ff 0f 0b CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 RSP: 0018:ffff8881ccdd7958 EFLAGS: 00010282 RAX: 000000000000004e RBX: ffff8881d11a1200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff885021e0 RDI: ffffffff8bad8720 RBP: ffff8881ccdd7970 R08: ffffed103eca4ea9 R09: ffffed103eca4ea8 R10: ffffed103eca4ea8 R11: ffff8881f6527547 R12: dead000000000200 R13: ffff8881d11a1280 R14: ffff8881d11a1280 R15: dffffc0000000000 FS: 00007f214aea3700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7c7476b000 CR3: 00000001d76de004 CR4: 00000000001626e0 CR2: 00007fadfb5c6740 CR3: 00000001eed73006 CR4: 00000000001626f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] coalesced_mmio_destructor+0x1a/0x150 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:99 kvm_iodevice_destructor include/kvm/iodev.h:73 [inline] kvm_vm_ioctl_unregister_coalesced_mmio+0x199/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:181 kvm: failed to shrink bus, removing it completely kvm_vm_ioctl+0x5ac/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3275 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 list_del corruption, ffff8881d615ca80->prev is LIST_POISON2 (dead000000000200) ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W