bisecting fixing commit since 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf
building syzkaller on 510951950dc0ee69cfdaf746061d3dbe31b49fd8
testing commit 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf with gcc (GCC) 8.1.0
kernel signature: 60fec8638c5eec2fa7ac7f4d906e2d1f00e8532edf0911b4fc7bdae4902084e8
run #0: crashed: INFO: rcu detected stall in tipc_release
run #1: crashed: INFO: rcu detected stall in tipc_release
run #2: boot failed: can't ssh into the instance
run #3: OK
run #4: boot failed: can't ssh into the instance
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
testing current HEAD c2e7554e1b85935d962127efa3c2a76483b0b3b6
testing commit c2e7554e1b85935d962127efa3c2a76483b0b3b6 with gcc (GCC) 8.1.0
kernel signature: 590752d6699ce96d1d3c2b54a28b905bbf659b809220e37d850e704db99a0daf
run #0: crashed: INFO: rcu detected stall in tipc_release
run #1: crashed: INFO: rcu detected stall in tipc_release
run #2: crashed: INFO: rcu detected stall in tipc_release
run #3: crashed: INFO: rcu detected stall in tipc_release
run #4: crashed: INFO: rcu detected stall in tipc_release
run #5: crashed: INFO: rcu detected stall in tipc_release
run #6: crashed: INFO: rcu detected stall in tipc_release
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor218524682" "root@10.128.0.28:./syz-executor218524682"]: exit status 1
ssh: connect to host 10.128.0.28 port 22: Connection timed out
lost connection

run #9: OK
Reproducer flagged being flaky
revisions tested: 2, total time: 31m9.549238642s (build: 9m40.16589347s, test: 20m54.524394876s)
the crash still happens on HEAD
commit msg: Merge tag 'gfs2-v5.10-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
crash: INFO: rcu detected stall in corrupted
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=9809, q=400)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294975302-4294964804), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10498 jiffies! g9809 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:14552 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x404/0x890 kernel/sched/core.c:4523
 schedule+0x38/0xe0 kernel/sched/core.c:4601
 schedule_timeout+0x1be/0x2e0 kernel/time/timer.c:1871
 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline]
 rcu_gp_kthread+0x707/0xc60 kernel/rcu/tree.c:2099
 kthread+0x145/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296