bisecting cause commit starting from c79f46a282390e0f5b306007bf7b11a46d529538 building syzkaller on 53430d97195bc8dc0221eaa2ea913237d82e199d testing commit c79f46a282390e0f5b306007bf7b11a46d529538 with gcc (GCC) 8.1.0 kernel signature: 044a973856d7730b778b7826eca4fbe68b2ef2e7 all runs: crashed: WARNING in restore_regulatory_settings testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: f53129d4302c050213a2f1a89338b622e8900906 all runs: crashed: WARNING in restore_regulatory_settings testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: b544914a4f6d3c85dac9bebb1a3bb1d30700ee54 all runs: crashed: WARNING in restore_regulatory_settings testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 34349af097519947f8707febacb8bfadf3598f84 all runs: crashed: WARNING in restore_regulatory_settings testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: abd70f7e27f331a52bcf929ce55fd6829125c950 all runs: crashed: WARNING in restore_regulatory_settings testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 9046c9104f7dbf9d0ad563ac4db6ed9353491a49 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 05c450a7571a8b1bdf86ca238c948b1b6670be7f all runs: crashed: WARNING in restore_regulatory_settings testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: c287698bfb0a370b4b32eaf3c9818f7ed585f2be all runs: crashed: WARNING in restore_regulatory_settings testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 1203ef13fd87492fb89aa894857f7ed992d006ba all runs: crashed: WARNING in restore_regulatory_settings testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 528b40f191ed70754aaa81aad0928f1ebbd056f1 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 4fa8929c95ad104eb16fc2ae79aa4c33ecd258ad all runs: crashed: WARNING in restore_regulatory_settings testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: f42543bcb8cccdf6fbf307d8185bf8334af9c236 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 9963c113a16c532be8bf85d9ef64e962aaa22360 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: fb023f35d659e8995bc0ef041f855ecc4566317b all runs: crashed: WARNING in restore_regulatory_settings testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: f9599d3bab65e459e7b88ca8b5934b06b1009059 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: 4520a3befae44f98618c9c3ee8a57418f030a1d0 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 3ab8d556011785770510e547902a8c746bd9287c all runs: crashed: WARNING in restore_regulatory_settings testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: fa8eddac5972747bbcd1453f46985c0ab27faef6 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: d3e9193a720ae36d105dc49ed2a85140b2d38805 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 9e62557ede93f9050f333c1d975a25d6861e8c39 all runs: crashed: WARNING in restore_regulatory_settings testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 3bd677a07e7b6adbad1bf3cc7eddde198374f77c all runs: crashed: WARNING in restore_regulatory_settings revisions tested: 21, total time: 3h1m47.233008689s (build: 1h48m36.904116765s, test: 1h11m3.162307723s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in restore_regulatory_settings IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready device veth1_vlan entered promiscuous mode ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7444 at net/wireless/reg.c:415 is_user_regdom_saved net/wireless/reg.c:413 [inline] WARNING: CPU: 1 PID: 7444 at net/wireless/reg.c:415 restore_alpha2 net/wireless/reg.c:2471 [inline] WARNING: CPU: 1 PID: 7444 at net/wireless/reg.c:415 restore_regulatory_settings+0x8f6/0xed0 net/wireless/reg.c:2563 Unexpected user alpha2: Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7444 Comm: kworker/1:2 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient crda_timeout_work 1ffffffff0dd577e ffff8800b5207920 ffffffff82c7f386 ffffffff85e84380 ffff8800b52079f8 ffffffff86741040 ffffffff85658776 ffff8800b52079e8 ffffffff81614a3e 0000000041b58ab3 ffffffff86afff74 ffffffff8161488f Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xe6/0x120 lib/dump_stack.c:51 [] panic+0x1af/0x348 kernel/panic.c:152 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] is_user_regdom_saved net/wireless/reg.c:413 [inline] [] restore_alpha2 net/wireless/reg.c:2471 [inline] [] restore_regulatory_settings+0x8f6/0xed0 net/wireless/reg.c:2563 [] crda_timeout_work+0x1a/0x30 net/wireless/reg.c:540 [] process_one_work+0x69b/0x1570 kernel/workqueue.c:2122 [] worker_thread+0xd7/0xf10 kernel/workqueue.c:2256 [] kthread+0x209/0x2d0 kernel/kthread.c:209 [] ret_from_fork+0x22/0x50 arch/x86/entry/entry_64.S:392 Kernel Offset: disabled