bisecting fixing commit since eb045674aab31aa55a4f9aec27cce36e3d946a21 building syzkaller on e2d91b1d0dd8c8b4760986ec8114469246022bb8 testing commit eb045674aab31aa55a4f9aec27cce36e3d946a21 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a23a020462ca632d5c6e2696345a7e9b7117d3fa6284fe43a5becafa34e85de1 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 74766a973637a02c32c04c1c6496e114e4855239 testing commit 74766a973637a02c32c04c1c6496e114e4855239 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 0284d9aa8472b5c60e857e222052afdb036b3612a5234476626009ddbd1b7e3e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m1.057591644s (build: 15m9.953359268s, test: 6m30.197862687s) the crash still happens on HEAD commit msg: Linux 4.14.275 crash: unregister_netdevice: waiting for DEV to become free print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt Buffer I/O error on dev loop0, logical block 8, async page read ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt Buffer I/O error on dev loop0, logical block 1, async page read ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: 31 callbacks suppressed print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt Buffer I/O error on dev loop0, logical block 0, async page read ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: 25 callbacks suppressed print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop0, sector 0 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt