bisecting cause commit starting from 3120b9a6a3f7487f96af7bd634ec49c87ef712ab building syzkaller on a60cb4cd840ce786236a00480e8bb1025e0c5fef testing commit 3120b9a6a3f7487f96af7bd634ec49c87ef712ab with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in pie_timer run #1: crashed: INFO: rcu detected stall in pie_timer run #2: crashed: INFO: rcu detected stall in pie_timer run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in run_timer_softirq run #5: crashed: INFO: rcu detected stall in call_timer_fn run #6: 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-executor487832721" "root@10.128.0.51:./syz-executor487832721"]: exit status 1 ssh: connect to host 10.128.0.51 port 22: Connection timed out lost connection run #7: 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-executor620978923" "root@10.128.1.52:./syz-executor620978923"]: exit status 1 ssh: connect to host 10.128.1.52 port 22: Connection timed out lost connection run #8: OK run #9: OK testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in sys_futex run #1: crashed: INFO: rcu detected stall in run_timer_softirq run #2: crashed: INFO: rcu detected stall in pie_timer run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in pie_timer run #7: 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-executor863361871" "root@10.128.0.224:./syz-executor863361871"]: exit status 1 ssh: connect to host 10.128.0.224 port 22: Connection timed out lost connection run #8: basic kernel testing failed: failed to copy test binary to VM: timedout ["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-executor799424098" "root@10.128.0.219:./syz-executor799424098"] Warning: Permanently added '10.128.0.219' (ECDSA) to the list of known hosts. run #9: OK testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in run_timer_softirq run #1: crashed: INFO: rcu detected stall in run_timer_softirq run #2: crashed: INFO: rcu detected stall in run_timer_softirq run #3: crashed: BUG: soft lockup in pie_timer run #4: crashed: INFO: rcu detected stall in run_timer_softirq run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in pie_timer run #9: crashed: INFO: rcu detected stall in run_timer_softirq testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in pie_timer run #1: crashed: INFO: rcu detected stall in pie_timer run #2: crashed: INFO: rcu detected stall in call_timer_fn run #3: crashed: INFO: rcu detected stall in run_timer_softirq run #4: crashed: INFO: rcu detected stall in do_signal run #5: crashed: INFO: rcu detected stall in run_timer_softirq run #6: crashed: INFO: rcu detected stall in run_timer_softirq run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in pie_timer run #9: 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-executor179481075" "root@10.128.0.5:./syz-executor179481075"]: exit status 1 ssh: connect to host 10.128.0.5 port 22: Connection timed out lost connection testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in pie_timer run #1: crashed: INFO: rcu detected stall in lock_is_held_type run #2: crashed: INFO: rcu detected stall in pie_timer run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in run_timer_softirq run #8: crashed: INFO: rcu detected stall in pie_timer run #9: crashed: INFO: rcu detected stall in run_timer_softirq testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in run_timer_softirq run #1: crashed: INFO: rcu detected stall in run_timer_softirq run #2: crashed: INFO: rcu detected stall in run_timer_softirq run #3: crashed: INFO: rcu detected stall in run_timer_softirq run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in pie_timer run #9: OK testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in pie_timer run #2: crashed: INFO: rcu detected stall in pie_timer run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in call_timer_fn run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in corrupted run #9: 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-executor352760906" "root@10.128.0.164:./syz-executor352760906"]: exit status 1 ssh: connect to host 10.128.0.164 port 22: Connection timed out lost connection testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in pie_timer run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in run_timer_softirq run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in run_timer_softirq run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in pie_timer testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in pie_timer run #2: crashed: INFO: rcu detected stall in run_timer_softirq run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in run_timer_softirq run #6: crashed: BUG: soft lockup in rcu_read_lock_sched_held run #7: crashed: INFO: rcu detected stall in call_timer_fn run #8: crashed: INFO: rcu detected stall in pie_timer run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in lock_is_held_type run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in call_timer_fn run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in pie_timer run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in pie_timer run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in __run_timers 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-executor259462629" "root@10.128.0.226:./syz-executor259462629"]: exit status 1 ssh: connect to host 10.128.0.226 port 22: Connection timed out lost connection run #9: OK testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in __run_timers run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in pie_timer run #7: 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-executor111795506" "root@10.128.15.196:./syz-executor111795506"]: exit status 1 ssh: connect to host 10.128.15.196 port 22: Connection timed out lost connection 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-executor214995689" "root@10.128.0.120:./syz-executor214995689"]: exit status 1 ssh: connect to host 10.128.0.120 port 22: Connection timed out lost connection run #9: 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-executor282600244" "root@10.128.0.197:./syz-executor282600244"]: exit status 1 ssh: connect to host 10.128.0.197 port 22: Connection timed out lost connection testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in call_timer_fn run #2: crashed: INFO: rcu detected stall in pie_timer run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in pie_timer run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in lock_is_held_type 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-executor015793286" "root@10.128.10.55:./syz-executor015793286"]: exit status 1 ssh: connect to host 10.128.10.55 port 22: Connection timed out lost connection run #9: OK testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in __run_timers run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in call_timer_fn run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in run_timer_softirq run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in run_timer_softirq run #8: crashed: INFO: rcu detected stall in pie_timer run #9: 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-executor551166746" "root@10.128.1.5:./syz-executor551166746"]: exit status 1 ssh: connect to host 10.128.1.5 port 22: Connection timed out lost connection testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in call_timer_fn run #1: crashed: INFO: rcu detected stall in pie_timer run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in run_timer_softirq run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in corrupted run #9: OK testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in run_timer_softirq run #9: crashed: INFO: rcu detected stall in run_timer_softirq testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in call_timer_fn run #1: crashed: INFO: rcu detected stall in run_timer_softirq run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in pie_timer run #5: crashed: INFO: rcu detected stall in corrupted run #6: 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-executor283408757" "root@10.128.1.7:./syz-executor283408757"]: exit status 1 ssh: connect to host 10.128.1.7 port 22: Connection timed out lost connection run #7: 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-executor155760720" "root@10.128.1.18:./syz-executor155760720"]: exit status 1 ssh: connect to host 10.128.1.18 port 22: Connection timed out lost connection 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-executor465072495" "root@10.128.0.158:./syz-executor465072495"]: exit status 1 ssh: connect to host 10.128.0.158 port 22: Connection timed out lost connection run #9: basic kernel testing failed: failed to copy test binary to VM: timedout ["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-executor903213058" "root@10.128.0.219:./syz-executor903213058"] Warning: Permanently added '10.128.0.219' (ECDSA) to the list of known hosts. testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in call_timer_fn run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in call_timer_fn run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: 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-executor648120452" "root@10.128.10.51:./syz-executor648120452"]: exit status 1 ssh: connect to host 10.128.10.51 port 22: Connection timed out lost connection testing release v4.5 testing commit b562e44f507e863c6792946e4e1b1449fbbac85d with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in run_timer_softirq run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in pie_timer run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in run_timer_softirq run #7: crashed: INFO: rcu detected stall in call_timer_fn run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.4 testing commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in pie_timer run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: OK testing release v4.3 testing commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in run_timer_softirq run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in run_timer_softirq run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.2 testing commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in call_timer_fn run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in run_timer_softirq run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.1 testing commit b953c0d234bc72e8489d3bf51a276c5c4ec85345 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in call_timer_fn run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in call_timer_fn run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in pie_timer run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted revisions tested: 24, total time: 5h39m20.382597392s (build: 1h40m49.329443684s, test: 3h52m6.306951264s) the crash already happened on the oldest tested release crash: INFO: rcu detected stall in corrupted INFO: rcu_preempt self-detected stall on CPU 1: (10500 ticks this GP) idle=38b/140000000000002/0 softirq=34882/34882 fqs=0 (t=10501 jiffies g=2258 c=2257 q=494) rcu_preempt kthread starved for 10501 jiffies! INFO: rcu_preempt detected stalls on CPUs/tasks: Tasks blocked on level-0 rcu_node (CPUs 0-1): 1: (10500 ticks this GP) idle=38b/140000000000002/0 softirq=34882/34882 fqs=0 (detected by 0, t=10502 jiffies, g=2258, c=2257, q=494) Task dump for CPU 1: syz-executor.1 R running task 12416 29916 5270 0x00000008 0000000000000096 0000000000000000 ffffffff8119b7f0 0000000000000000 ffff880121aa01b8 ffff88012b707c00 0000000000000000 0000000000000007 ffff8800a9100850 ffff8800a8ecfcc8 ffff8800a91010b8 0000000000000000 Call Trace: rcu_preempt kthread starved for 10502 jiffies! INFO: rcu_sched detected stalls on CPUs/tasks: 1: (10500 ticks this GP) idle=38b/140000000000002/0 softirq=34882/34882 fqs=0 (detected by 0, t=10502 jiffies, g=1604, c=1603, q=4) Task dump for CPU 1: syz-executor.1 R running task 12416 29916 5270 0x00000008 0000000000000096 0000000000000000 ffffffff8119b7f0 0000000000000000 ffff880121aa01b8 ffff88012b707c00 0000000000000000 0000000000000007 ffff8800a9100850 ffff8800a8ecfcc8 ffff8800a91010b8 0000000000000000 Call Trace: rcu_sched kthread starved for 10502 jiffies! Task dump for CPU 1: syz-executor.1 R running task 12416 29916 5270 0x00000008 ffff8800a9100850 ffff88012c103ae0 ffffffff811a3242 0000000000000001 0000000000000001 ffffffff8325cdc0 0000000000000082 ffff88012c103b00 ffffffff811a7728 ffffffff8325cdc0 0000000000000002 ffff88012c103b30 Call Trace: [] sched_show_task+0xf2/0x1a0 kernel/sched/core.c:4545 [] dump_cpu_task+0x38/0x40 kernel/sched/core.c:8380 [] rcu_dump_cpu_stacks+0x90/0xe0 kernel/rcu/tree.c:1156 [] print_cpu_stall kernel/rcu/tree.c:1262 [inline] [] check_cpu_stall kernel/rcu/tree.c:1326 [inline] [] __rcu_pending kernel/rcu/tree.c:3422 [inline] [] rcu_pending kernel/rcu/tree.c:3486 [inline] [] rcu_check_callbacks+0x8bd/0xd70 kernel/rcu/tree.c:2703 [] update_process_times+0x34/0x60 kernel/time/timer.c:1396 [] tick_sched_handle.isra.22+0x20/0x60 kernel/time/tick-sched.c:151 [] tick_sched_timer+0x3c/0x80 kernel/time/tick-sched.c:1124 [] __run_hrtimer+0xe6/0x760 kernel/time/hrtimer.c:1220 [] hrtimer_interrupt+0x103/0x230 kernel/time/hrtimer.c:1299 [] local_apic_timer_interrupt+0x35/0x60 arch/x86/kernel/apic/apic.c:890 [] smp_apic_timer_interrupt+0x3c/0x50 arch/x86/kernel/apic/apic.c:914 [] apic_timer_interrupt+0x73/0x80 arch/x86/kernel/entry_64.S:923 [] rcu_lockdep_current_cpu_online.part.60+0x16/0x80 kernel/rcu/tree.c:977 [] rcu_lockdep_current_cpu_online+0x21/0x30 kernel/rcu/tree.c:969 [] rcu_read_lock_sched_held include/linux/rcupdate.h:508 [inline] [] trace_timer_expire_entry include/trace/events/timer.h:75 [inline] [] call_timer_fn+0x361/0x520 kernel/time/timer.c:1152 [] __run_timers kernel/time/timer.c:1225 [inline] [] run_timer_softirq+0x2ac/0x4a0 kernel/time/timer.c:1415 [] __do_softirq+0x15c/0x6c0 kernel/softirq.c:273 [] invoke_softirq kernel/softirq.c:350 [inline] [] irq_exit+0xc5/0xe0 kernel/softirq.c:391 [] exiting_irq arch/x86/include/asm/apic.h:649 [inline] [] smp_apic_timer_interrupt+0x41/0x50 arch/x86/kernel/apic/apic.c:915 [] apic_timer_interrupt+0x73/0x80 arch/x86/kernel/entry_64.S:923 [] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:809 [inline] [] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline] [] ? _raw_spin_unlock_irqrestore+0x64/0xa0 kernel/locking/spinlock.c:191 [] try_to_wake_up+0x214/0x350 kernel/sched/core.c:1707 [] wake_up_state+0xb/0x10 kernel/sched/core.c:1769 [] wake_futex+0x61/0x80 kernel/futex.c:1121 [] futex_wake+0x10a/0x150 kernel/futex.c:1247 [] do_futex+0xf0/0xa70 kernel/futex.c:2948 [] SYSC_futex kernel/futex.c:3002 [inline] [] SyS_futex+0x6d/0x160 kernel/futex.c:2972 [] system_call_fastpath+0x16/0x7a