bisecting fixing commit since 46cf053efec6a3a5f343fead837777efe8252a46
building syzkaller on be5c2c81971442d623dd1b265dabf4644ceeb35b
testing commit 46cf053efec6a3a5f343fead837777efe8252a46 with gcc (GCC) 8.1.0
kernel signature: 7506174c331db9a2a0c8ba701142b30e003e808f9875029d5574c16e8512322d
run #0: crashed: KASAN: use-after-free Read in j1939_tp_txtimer
run #1: crashed: KASAN: use-after-free Read in j1939_tp_txtimer
run #2: crashed: KASAN: slab-out-of-bounds Read in j1939_tp_txtimer
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing current HEAD fb33c6510d5595144d585aa194d377cf74d31911
testing commit fb33c6510d5595144d585aa194d377cf74d31911 with gcc (GCC) 8.1.0
kernel signature: 77c9bd901839f8672a5547a5c48300ebca7384f0dcff9a094821189a28bd068e
run #0: crashed: KASAN: use-after-free Read in j1939_tp_txtimer
run #1: crashed: KASAN: use-after-free Read in j1939_tp_txtimer
run #2: crashed: KASAN: slab-out-of-bounds Read in j1939_tp_txtimer
run #3: crashed: unregister_netdevice: waiting for DEV to become free
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 36m9.14898816s (build: 12m35.143519935s, test: 23m5.605896405s)
the crash still happens on HEAD
commit msg: Linux 5.6-rc6
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for vcan0 to become free. Usage count = 6