bisecting fixing commit since d6765985a42a660f078896d5c5b27f97c580a490 building syzkaller on 9d2ab5dfe7727dfea4b9b279f4edf731acb386ef testing commit d6765985a42a660f078896d5c5b27f97c580a490 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 584cdbed6025e734e28f73948f0a58add6a0fd2273e111c582898cde758bbfe5 run #0: crashed: INFO: rcu detected stall in net_tx_action run #1: crashed: INFO: rcu detected stall in tc_modify_qdisc run #2: crashed: INFO: rcu detected stall in tc_modify_qdisc run #3: crashed: INFO: rcu detected stall in tc_modify_qdisc run #4: crashed: INFO: rcu detected stall in tc_modify_qdisc run #5: crashed: INFO: rcu detected stall in net_tx_action run #6: crashed: INFO: rcu detected stall in tc_modify_qdisc run #7: crashed: INFO: rcu detected stall in tc_modify_qdisc run #8: crashed: INFO: rcu detected stall in tc_modify_qdisc run #9: crashed: INFO: rcu detected stall in net_tx_action run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: INFO: rcu detected stall in net_tx_action run #12: crashed: BUG: soft lockup in net_tx_action run #13: crashed: INFO: rcu detected stall in ieee80211_iface_work run #14: crashed: INFO: rcu detected stall in ieee80211_iface_work run #15: crashed: BUG: workqueue lockup run #16: crashed: INFO: rcu detected stall in tc_modify_qdisc run #17: crashed: BUG: soft lockup in tc_modify_qdisc run #18: crashed: INFO: rcu detected stall in ieee80211_iface_work run #19: OK testing current HEAD 3b89b511ea0c705cc418440e2abf9d692a556d84 testing commit 3b89b511ea0c705cc418440e2abf9d692a556d84 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 985793c80691b27ec5a4972b5e98bd17e08ac318a4d657fdcb3f52cd63e4ef7d all runs: crashed: INFO: rcu detected stall in corrupted revisions tested: 2, total time: 28m55.772533729s (build: 13m14.972178566s, test: 14m49.014409392s) the crash still happens on HEAD commit msg: net: fix IFF_TX_SKB_NO_LINEAR definition crash: INFO: rcu detected stall in corrupted rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 6 jiffies s: 7221 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Task dump for CPU 0: task:swapper/0 state:R running task stack:28544 pid: 0 ppid: 0 flags:0x00004008 Call Trace: