ci2 starts bisection 2024-09-06 00:23:39.378183498 +0000 UTC m=+54959.675263610 bisecting fixing commit since 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 building syzkaller on 1e9c4cf3ae82ef82220af312606fffe65e124563 ensuring issue is reproducible on original commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ebd31d63b2be2823ba5b83e6ef2a69776edc3dceb1d4b12ca6a7711ea8c69431 all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] check whether we can drop unnecessary instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9da81347cdc29845e0285f344741d0aba7d4e5a4d0aa63e81227c0e845242b7a all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] the bug reproduces without the instrumentation disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=3706 full=7299 leaves diff=2036 split chunks (needed=false): <2036> split chunk #0 of len 2036 into 5 parts testing without sub-chunk 1/5 disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 86d8e0652176e70523ef8fc10a884bc6adcf0a3e7ccb661b60f818d6ff5845f1 all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG LOCKDEP], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5850a21500c5eccaf85aa6b6723e624216a14bab11d9bac7185530d701b8d30e all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a41e9a6a30a0c8ad7cbc5d2d0ef7a94ebaab1b4a2971085130d0ff491eb1c71b all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 991253fa1a9a5c7cc0f09524accecdfb58062f79869359eb5338cef4f651b459 all runs: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f268a94344abdf042eda84b5fdbbcf22bdf177db121bc25182d471aec7d6d2b0 all runs: OK false negative chance: 0.000 minimized to 404 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB FRONTSWAP GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTPLUG_SPARSE MEMORY_HOTREMOVE MFD_VIPERBOARD PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_CONFIGFS USB_CONFIGFS_F_TCM USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_PHONET USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CONN_GPIO USB_CXACRU USB_CYPRESS_CY7C63 USB_CYTHERM USB_DSBR USB_DUMMY_HCD USB_DWC2 USB_DWC2_HOST USB_DWC2_PCI USB_DWC3 USB_DWC3_GADGET USB_DWC3_HAPS USB_DWC3_OF_SIMPLE 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USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_U132_HCD USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PCI_RENESAS USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USB_ZR364XX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VETH VFIO VFIO_IOMMU_TYPE1 VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOBUF_GEN VIDEOBUF_VMALLOC VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CPIA2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_STK1160_COMMON VIDEO_TM6000 VIDEO_TM6000_ALSA VIDEO_TM6000_DVB VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2 VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK X86_SGX X86_X2APIC X86_X32 XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XILLYBUS_CLASS XILLYUSB XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing current HEAD 14e468424d3edcf23167133d6ee2f3e3c6c5a022 testing commit 14e468424d3edcf23167133d6ee2f3e3c6c5a022 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 839b2a3efc3aeabf1ef6049087cb8181ea6acb3b554bf2a8c292daec34d9e541 run #0: crashed: KASAN: use-after-free Read in v4l2_fh_init run #1: crashed: KASAN: use-after-free Read in v4l2_fh_init run #2: crashed: KASAN: use-after-free Read in v4l2_fh_init run #3: crashed: KASAN: out-of-bounds Read in v4l2_fh_init run #4: crashed: KASAN: use-after-free Read in v4l2_fh_init run #5: crashed: KASAN: use-after-free Read in v4l2_fh_init run #6: crashed: KASAN: use-after-free Read in v4l2_fh_init run #7: crashed: KASAN: use-after-free Read in v4l2_fh_init run #8: crashed: KASAN: use-after-free Read in v4l2_fh_init run #9: crashed: KASAN: use-after-free Read in v4l2_fh_init representative crash: KASAN: use-after-free Read in v4l2_fh_init, types: [KASAN] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 1h29m41.968056862s (build: 35m8.707756477s, test: 52m30.609703547s) crash still not fixed or there were kernel test errors commit msg: Linux 5.15.166 crash: KASAN: use-after-free Read in v4l2_fh_init ================================================================== BUG: KASAN: use-after-free in v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 Read of size 8 at addr ffff88812a9c0868 by task v4l_id/3499 CPU: 0 PID: 3499 Comm: v4l_id Not tainted 5.15.166-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x41/0x5e lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:451 v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 v4l2_fh_open+0x78/0xb0 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0xd6/0x430 drivers/media/usb/em28xx/em28xx-video.c:2163 v4l2_open+0x1d6/0x350 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x20f/0x650 fs/char_dev.c:414 do_dentry_open+0x45e/0xfc0 fs/open.c:826 do_open fs/namei.c:3608 [inline] path_openat+0x1542/0x2360 fs/namei.c:3742 do_filp_open+0x199/0x3d0 fs/namei.c:3769 do_sys_openat2+0x11e/0x400 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ff4d532d9a4 Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff0554e650 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fff0554e868 RCX: 00007ff4d532d9a4 RDX: 0000000000000000 RSI: 00007fff0554ef22 RDI: 00000000ffffff9c RBP: 00007fff0554ef22 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0554e880 R14: 000055f341914670 R15: 00007ff4d5776a80 Allocated by task 1165: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0x7c/0x90 mm/kasan/common.c:522 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x8b/0x280 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1167 [inline] alloc_skb_with_frags+0x72/0x4a0 net/core/skbuff.c:6170 sock_alloc_send_pskb+0x62a/0x7b0 net/core/sock.c:2530 unix_dgram_sendmsg+0x32b/0x1550 net/unix/af_unix.c:1805 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg+0xab/0xe0 net/socket.c:716 __sys_sendto+0x1a4/0x270 net/socket.c:2058 __do_sys_sendto net/socket.c:2070 [inline] __se_sys_sendto net/socket.c:2066 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:2066 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 1158: 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:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook mm/slub.c:1731 [inline] slab_free mm/slub.c:3499 [inline] kfree+0xd0/0x4c0 mm/slub.c:4559 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x479/0x590 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] consume_skb net/core/skbuff.c:914 [inline] consume_skb+0xcc/0x1e0 net/core/skbuff.c:908 skb_free_datagram+0xd/0xb0 net/core/datagram.c:325 __unix_dgram_recvmsg+0x655/0xb90 net/unix/af_unix.c:2391 sock_recvmsg_nosec net/socket.c:966 [inline] sock_recvmsg net/socket.c:984 [inline] sock_recvmsg net/socket.c:980 [inline] sock_read_iter+0x2b4/0x3f0 net/socket.c:1057 call_read_iter include/linux/fs.h:2166 [inline] new_sync_read+0x4a2/0x5f0 fs/read_write.c:404 vfs_read+0x209/0x470 fs/read_write.c:485 ksys_read+0x171/0x1d0 fs/read_write.c:623 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88812a9c0800 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 104 bytes inside of 512-byte region [ffff88812a9c0800, ffff88812a9c0a00) The buggy address belongs to the page: page:ffffea0004aa7000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12a9c0 head:ffffea0004aa7000 order:2 compound_mapcount:0 compound_pincount:0 memcg:ffff888117fcbe01 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 0000000000000000 dead000000000122 ffff888100042dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff888117fcbe01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1165, ts 62979543289, free_ts 62969436800 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1290/0x2d30 mm/page_alloc.c:4159 __alloc_pages+0x1b2/0x420 mm/page_alloc.c:5423 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab+0x2eb/0x430 mm/slub.c:1912 new_slab mm/slub.c:1975 [inline] ___slab_alloc+0xb1c/0xf80 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node_track_caller+0x16d/0x420 mm/slub.c:4958 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x8b/0x280 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1167 [inline] alloc_skb_with_frags+0x72/0x4a0 net/core/skbuff.c:6170 sock_alloc_send_pskb+0x62a/0x7b0 net/core/sock.c:2530 unix_dgram_sendmsg+0x32b/0x1550 net/unix/af_unix.c:1805 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg+0xab/0xe0 net/socket.c:716 __sys_sendto+0x1a4/0x270 net/socket.c:2058 __do_sys_sendto net/socket.c:2070 [inline] __se_sys_sendto net/socket.c:2066 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:2066 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare+0x34e/0x730 mm/page_alloc.c:1391 free_unref_page_prepare mm/page_alloc.c:3317 [inline] free_unref_page+0x19/0x4b0 mm/page_alloc.c:3396 stack_depot_save+0x160/0x3f0 lib/stackdepot.c:335 kasan_save_stack+0x32/0x40 mm/kasan/common.c:40 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0x7c/0x90 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] usb_parse_configuration drivers/usb/core/config.c:784 [inline] usb_get_configuration+0x9a5/0x3120 drivers/usb/core/config.c:956 usb_enumerate_device drivers/usb/core/hub.c:2425 [inline] usb_new_device+0x559/0x800 drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5455 [inline] hub_port_connect_change drivers/usb/core/hub.c:5595 [inline] port_event drivers/usb/core/hub.c:5741 [inline] hub_event+0x10e9/0x36b0 drivers/usb/core/hub.c:5823 process_one_work+0x800/0x11a0 kernel/workqueue.c:2310 process_scheduled_works kernel/workqueue.c:2373 [inline] worker_thread+0x602/0xdd0 kernel/workqueue.c:2459 kthread+0x2f8/0x3b0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88812a9c0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88812a9c0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88812a9c0800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88812a9c0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812a9c0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================