bisecting cause commit starting from c6dd78fcb8eefa15dd861889e0f59d301cb5230c building syzkaller on 1656845f45f284c574eb4f8bfe85dd7916a47a3a testing commit c6dd78fcb8eefa15dd861889e0f59d301cb5230c with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in rose_send_frame run #1: crashed: general protection fault in rose_send_frame run #2: crashed: general protection fault in rose_send_frame run #3: crashed: general protection fault in rose_send_frame run #4: crashed: general protection fault in rose_send_frame run #5: crashed: general protection fault in rose_send_frame run #6: crashed: general protection fault in ax25cmp run #7: crashed: general protection fault in rose_send_frame run #8: crashed: general protection fault in rose_send_frame run #9: crashed: general protection fault in rose_send_frame testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in rose_send_frame run #1: crashed: general protection fault in rose_send_frame run #2: crashed: general protection fault in rose_send_frame run #3: crashed: general protection fault in rose_send_frame run #4: crashed: general protection fault in rose_send_frame run #5: crashed: general protection fault in ax25cmp run #6: crashed: general protection fault in rose_send_frame run #7: crashed: general protection fault in rose_send_frame run #8: crashed: general protection fault in rose_send_frame run #9: crashed: general protection fault in rose_send_frame testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in rose_send_frame run #1: crashed: general protection fault in rose_send_frame run #2: crashed: general protection fault in ax25cmp run #3: crashed: general protection fault in rose_send_frame run #4: crashed: general protection fault in rose_send_frame run #5: crashed: general protection fault in rose_send_frame run #6: crashed: general protection fault in rose_send_frame run #7: crashed: general protection fault in rose_send_frame run #8: crashed: general protection fault in rose_send_frame run #9: crashed: general protection fault in rose_send_frame testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in rose_send_frame run #1: crashed: general protection fault in rose_send_frame run #2: crashed: general protection fault in rose_send_frame run #3: crashed: general protection fault in ax25cmp run #4: crashed: general protection fault in rose_send_frame run #5: crashed: general protection fault in rose_send_frame run #6: crashed: general protection fault in rose_send_frame run #7: crashed: general protection fault in rose_send_frame run #8: crashed: general protection fault in rose_send_frame run #9: crashed: general protection fault in rose_send_frame testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 run #0: crashed: general protection fault in rose_send_frame run #1: crashed: general protection fault in rose_send_frame run #2: crashed: general protection fault in rose_send_frame run #3: crashed: general protection fault in rose_send_frame run #4: crashed: general protection fault in rose_send_frame run #5: crashed: general protection fault in rose_send_frame run #6: crashed: general protection fault in rose_send_frame run #7: crashed: general protection fault in rose_send_frame run #8: crashed: general protection fault in ax25cmp run #9: crashed: general protection fault in ax25cmp testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 all runs: crashed: general protection fault in rose_send_frame testing release v4.5 testing commit b562e44f507e863c6792946e4e1b1449fbbac85d with gcc (GCC) 5.5.0 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame testing release v4.4 testing commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc with gcc (GCC) 5.5.0 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame testing release v4.3 testing commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861 with gcc (GCC) 5.5.0 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in ax25cmp run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.2 testing commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 with gcc (GCC) 5.5.0 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.1 testing commit b953c0d234bc72e8489d3bf51a276c5c4ec85345 with gcc (GCC) 5.5.0 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #3: crashed: BUG: unable to handle kernel run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in rose_send_frame run #8: crashed: no output from test machine run #9: crashed: no output from test machine revisions tested: 24, total time: 3h34m54.846933262s (build: 1h47m11.529334096s, test: 1h41m6.487967802s) the crash already happened on the oldest tested release crash: no output from test machine