bisecting fixing commit since dfb571610ba392179348c8472bfb131d4173d585
building syzkaller on f89ed068375b8e31b9575a0ecc834c602657a9a9
testing commit dfb571610ba392179348c8472bfb131d4173d585 with gcc (GCC) 8.4.1 20210217
kernel signature: 486cd310a7afc7f2a03f7a8cb4bd0b2a57df1eb71f8606cb08ba8515b34281b1
run #0: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #1: crashed: SYZFAIL: netlink_send_ext: netlink read failed
run #2: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #3: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #4: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #5: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #6: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #7: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #8: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #9: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #10: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #11: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #12: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #13: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #14: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #15: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #16: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #17: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #18: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #19: crashed: SYZFAIL: netlink_send_ext: short netlink write
testing current HEAD 6b7b0056defc6eb5c87bbe4690ccda547b2891aa
testing commit 6b7b0056defc6eb5c87bbe4690ccda547b2891aa with gcc (GCC) 8.4.1 20210217
kernel signature: 3ffbac671f1b527048b6ee9dc1bbcd83cb60821430da90020c2ab2682e13e17c
run #0: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #1: crashed: SYZFAIL: netlink_send_ext: netlink read failed
run #2: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #3: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #4: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #5: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #6: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #7: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #8: crashed: SYZFAIL: netlink_send_ext: short netlink write
run #9: crashed: SYZFAIL: netlink_send_ext: short netlink write
revisions tested: 2, total time: 27m40.770372283s (build: 19m37.54925464s, test: 7m37.176020731s)
the crash still happens on HEAD
commit msg: Linux 4.19.192
crash: SYZFAIL: netlink_send_ext: short netlink write
2021/06/03 03:13:28 executed programs: 636
2021/06/03 03:13:33 result: hanged=false err=executor 3: exit status 67
SYZFAIL: netlink_send_ext: short netlink write
wrote=-1, want=36 (errno 9: Bad file descriptor)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67


SYZFAIL: netlink_send_ext: short netlink write
wrote=-1, want=36 (errno 9: Bad file descriptor)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67
2021/06/03 03:13:33 executed programs: 1321
2021/06/03 03:13:40 executed programs: 1327
2021/06/03 03:13:41 result: hanged=false err=executor 0: exit status 67
SYZFAIL: netlink_send_ext: short netlink write
wrote=-1, want=36 (errno 9: Bad file descriptor)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67


SYZFAIL: netlink_send_ext: short netlink write
wrote=-1, want=36 (errno 9: Bad file descriptor)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67