bisecting fixing commit since b94de4d19498b454645b72d08a05d32fa9074fb5 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit b94de4d19498b454645b72d08a05d32fa9074fb5 with gcc (GCC) 8.4.1 20210217 kernel signature: 8cbc88553445e531e6133fcabac3cb2447db37de93e6efddcc7d57aff0134016 run #0: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #1: crashed: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio run #2: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #3: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #4: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #5: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #6: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #7: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #8: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #9: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #10: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #11: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #12: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #13: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #14: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #15: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #16: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #17: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #18: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio run #19: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio testing current HEAD 125222814e7b8f84df767d6ab622aff2a6d2f234 testing commit 125222814e7b8f84df767d6ab622aff2a6d2f234 with gcc (GCC) 8.4.1 20210217 kernel signature: 2ade8d088c20c0261b4b898153cdad542b338555f5f09ff9133f7b3e54189e1d all runs: crashed: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio revisions tested: 2, total time: 22m5.205833381s (build: 15m7.243486352s, test: 6m31.907238409s) the crash still happens on HEAD commit msg: Linux 4.19.182 crash: KASAN: use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio RBP: 00007fa91e0e71d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1f10497f R14: 00007fa91e0e7300 R15: 0000000000022000 kvm: failed to shrink bus, removing it completely ================================================================== BUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x1f2/0x2a0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:178 Read of size 8 at addr ffff8881f447ad00 by task syz-executor.3/9276 CPU: 1 PID: 9276 Comm: syz-executor.3 Not tainted 4.19.182-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:3251 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:00007fa91e0e7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007fa91e0e71d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1f10497f R14: 00007fa91e0e7300 R15: 0000000000022000 Allocated by task 9276: 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:3242 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 Freed by task 9276: 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:3874 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:3251 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 The buggy address belongs to the object at ffff8881f447ad00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8881f447ad00, ffff8881f447ad40) The buggy address belongs to the page: page:ffffea0007d11e80 count:1 mapcount:0 mapping:ffff8881f6000340 index:0x0 flags: 0x17ff00000000100(slab) raw: 017ff00000000100 ffffea0007d4fe08 ffffea0007d03fc8 ffff8881f6000340 raw: 0000000000000000 ffff8881f447a000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881f447ac00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8881f447ac80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff8881f447ad00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8881f447ad80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8881f447ae00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ================================================================== list_del corruption, ffff8881f447ad00->prev is LIST_POISON2 (dead000000000200) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:50! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 9276 Comm: syz-executor.3 Tainted: G B 4.19.182-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 40 09 50 88 48 89 de e8 c1 ff f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 80 0a 50 88 e8 ad ff f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 20 0a 50 88 e8 99 ff f7 ff 0f 0b RSP: 0018:ffff8881cca67958 EFLAGS: 00010282 RAX: 000000000000004e RBX: ffff8881f447ad00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88500780 RDI: ffffffff8bad7720 RBP: ffff8881cca67970 R08: ffffed103ec84e99 R09: ffffed103ec84e98 R10: ffffed103ec84e98 R11: ffff8881f64274c7 R12: dead000000000200 R13: ffff8881e88757c0 R14: ffff8881e88757c0 R15: dffffc0000000000 FS: 00007fa91e0e7700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e373ea000 CR3: 00000001d2990006 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:3251 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:00007fa91e0e7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000020000180 RSI: 000000004010ae68 RDI: 0000000000000004 RBP: 00007fa91e0e71d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1f10497f R14: 00007fa91e0e7300 R15: 0000000000022000 Modules linked in: ---[ end trace a2c9f3acbe5ff8c1 ]--- 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 40 09 50 88 48 89 de e8 c1 ff f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 80 0a 50 88 e8 ad ff f7 ff <0f> 0b 4c 89 ea 48 89 de 48 c7 c7 20 0a 50 88 e8 99 ff f7 ff 0f 0b RSP: 0018:ffff8881cca67958 EFLAGS: 00010282 RAX: 000000000000004e RBX: ffff8881f447ad00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88500780 RDI: ffffffff8bad7720 RBP: ffff8881cca67970 R08: ffffed103ec84e99 R09: ffffed103ec84e98 R10: ffffed103ec84e98 R11: ffff8881f64274c7 R12: dead000000000200 R13: ffff8881e88757c0 R14: ffff8881e88757c0 R15: dffffc0000000000 FS: 00007fa91e0e7700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e373ea000 CR3: 00000001d2990001 CR4: 00000000001626f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400