bisecting cause commit starting from bf8f5de17442bba5f811e7e724980730e079ee11 building syzkaller on d5a5d045176c34bd1066e2b8ce843b3dc8a67ee0 testing commit bf8f5de17442bba5f811e7e724980730e079ee11 with gcc (GCC) 8.1.0 kernel signature: 3c4968612a60ce6fa91ef5ea39ea4395ac5d98b3 run #0: crashed: WARNING in task_participate_group_stop run #1: crashed: WARNING in task_participate_group_stop run #2: crashed: WARNING in task_participate_group_stop run #3: crashed: WARNING in task_participate_group_stop run #4: crashed: WARNING in task_participate_group_stop run #5: crashed: WARNING in task_participate_group_stop run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in task_participate_group_stop run #8: crashed: WARNING in task_participate_group_stop run #9: crashed: WARNING in task_participate_group_stop testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 98eaadc47bdf15df5df267df57dc35883a3aa74f all runs: crashed: WARNING in task_participate_group_stop testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: a965b6ec77076f4d634264cac36f23415743b8db all runs: crashed: WARNING in task_participate_group_stop testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 39bf5eb169add34043121d9b9dcec1264731a800 all runs: crashed: WARNING in task_participate_group_stop testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 00f6438ab2d9bf00bb33e6c635c0d3d5ba2a2e84 all runs: crashed: WARNING in task_participate_group_stop testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 9ecd807084aa2e35294783f749d63fee22df13a8 all runs: crashed: WARNING in task_participate_group_stop testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: ca49856485e10fac027e05d1c8a702552a58da0b all runs: crashed: WARNING in task_participate_group_stop testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 1700f406a3e6f832a5753c1b37a8fc39cb30ef2d all runs: crashed: WARNING in task_participate_group_stop testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 673f9bda7eb32fe9c3b6d4c6c32cdb5835e5f805 all runs: crashed: WARNING in task_participate_group_stop testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: ec5c8bf4a75519b5324cb957ccbd41d3ab6a1ff6 all runs: crashed: WARNING in task_participate_group_stop testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: c3a8f989b39ed8e621abebe4e2ecc1026c28ddf0 all runs: crashed: WARNING in task_participate_group_stop testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 916242db28d37939a5d037e9c63af5ee93657ed5 all runs: crashed: WARNING in task_participate_group_stop testing release v4.5 testing commit b562e44f507e863c6792946e4e1b1449fbbac85d with gcc (GCC) 5.5.0 kernel signature: ecf2ef89666c76fbbdc2a30f93dfdd809be0ffe1 all runs: crashed: WARNING in task_participate_group_stop testing release v4.4 testing commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc with gcc (GCC) 5.5.0 kernel signature: 47ac43ebda2dc21adc0bd8b81e3239cc7058484a run #0: crashed: WARNING in task_participate_group_stop run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in task_participate_group_stop run #3: crashed: WARNING in task_participate_group_stop run #4: crashed: WARNING in task_participate_group_stop run #5: crashed: WARNING in task_participate_group_stop run #6: crashed: WARNING in task_participate_group_stop run #7: crashed: WARNING in task_participate_group_stop run #8: crashed: WARNING in task_participate_group_stop run #9: crashed: WARNING in task_participate_group_stop testing release v4.3 testing commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861 with gcc (GCC) 5.5.0 kernel signature: 206600ee49887f15cd38ee2ea77534b11f0ff679 run #0: crashed: WARNING in task_participate_group_stop run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in task_participate_group_stop run #4: crashed: WARNING in task_participate_group_stop run #5: crashed: WARNING in task_participate_group_stop run #6: crashed: WARNING in task_participate_group_stop run #7: crashed: WARNING in task_participate_group_stop run #8: crashed: WARNING in task_participate_group_stop run #9: crashed: WARNING in task_participate_group_stop testing release v4.2 testing commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 with gcc (GCC) 5.5.0 kernel signature: b85e200e66bce6da82d7645340767089875e8b7e run #0: crashed: WARNING in task_participate_group_stop run #1: crashed: WARNING in task_participate_group_stop run #2: crashed: WARNING in task_participate_group_stop run #3: crashed: WARNING in task_participate_group_stop run #4: crashed: WARNING in task_participate_group_stop run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in task_participate_group_stop run #7: crashed: WARNING in task_participate_group_stop run #8: crashed: WARNING in task_participate_group_stop run #9: crashed: WARNING in task_participate_group_stop testing release v4.1 testing commit b953c0d234bc72e8489d3bf51a276c5c4ec85345 with gcc (GCC) 5.5.0 kernel signature: 3aedbd1ac25217a647a54e0ed60019f59e4ffa91 run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in task_participate_group_stop run #2: crashed: WARNING in task_participate_group_stop run #3: crashed: WARNING in task_participate_group_stop run #4: crashed: WARNING in task_participate_group_stop run #5: crashed: WARNING in task_participate_group_stop run #6: crashed: WARNING in task_participate_group_stop run #7: crashed: WARNING in task_participate_group_stop run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in corrupted revisions tested: 17, total time: 1h58m58.62075956s (build: 59m23.218353686s, test: 54m50.215793964s) the crash already happened on the oldest tested release commit msg: Linux 4.1 crash: WARNING in corrupted cfg80211: Exceeded CRDA call max attempts. Not calling CRDA bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered forwarding state ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4259 at kernel/signal.c:341 task_participate_group_stop+0xee/0x100 kernel/signal.c:341() Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 4259 Comm: 3 Not tainted 4.1.0-syzkaller #0 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 4264 at kernel/signal.c:341 task_participate_group_stop+0xee/0x100 kernel/signal.c:341() Modules linked in: Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffffffff82b89210 ffff880211e2fc48 ffffffff8247bc7b 0000000000000032 ffffffff82b87246 ffff880211e2fcc8 ffffffff82477ead ffff880211e2fc68 ffffffff00000008 ffff880211e2fcd8 ffff880211e2fc78 ffffffff831d91c8 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x4c/0x65 lib/dump_stack.c:50 [] panic+0xcd/0x211 kernel/panic.c:111 [] warn_slowpath_common+0xbb/0xc0 kernel/panic.c:442 [] warn_slowpath_null+0x15/0x20 kernel/panic.c:479 [] task_participate_group_stop+0xee/0x100 kernel/signal.c:341 [] do_signal_stop+0x8c/0x2a0 kernel/signal.c:2065 [] get_signal+0x2b9/0xa10 kernel/signal.c:2242 [] do_signal+0x23/0xaf0 arch/x86/kernel/signal.c:690 [] do_notify_resume+0x58/0x70 arch/x86/kernel/signal.c:735 [] int_signal+0x12/0x17 CPU: 1 PID: 4264 Comm: 3 Not tainted 4.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffffffff82b89210 ffff8800b9d53cc8 ffffffff8247bc7b 0000000000000000 0000000000000000 ffff8800b9d53d08 ffffffff8116a905 0000000000000001 ffff88021648a4d0 ffff88021663a700 0000000000040000 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x4c/0x65 lib/dump_stack.c:50 [] warn_slowpath_common+0x85/0xc0 kernel/panic.c:446 [] warn_slowpath_null+0x15/0x20 kernel/panic.c:479 [] task_participate_group_stop+0xee/0x100 kernel/signal.c:341 [] do_signal_stop+0x8c/0x2a0 kernel/signal.c:2065 [] get_signal+0x2b9/0xa10 kernel/signal.c:2242 [] do_signal+0x23/0xaf0 arch/x86/kernel/signal.c:690 [] do_notify_resume+0x58/0x70 arch/x86/kernel/signal.c:735 [] int_signal+0x12/0x17 ---[ end trace 55652d1e2e4efd51 ]--- Kernel Offset: disabled