bisecting fixing commit since eb575cd5d7f60241d016fdd13a9e86d962093c9b building syzkaller on c06f97ad4b8a38e6396ff90f6084063f2303ad43 testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 9c3397b27399be67b07269145f486a089654d6886dab31e933c593aad83cbef9 run #0: crashed: WARNING in drm_format_info run #1: crashed: WARNING in drm_format_info run #2: crashed: WARNING in drm_format_info run #3: crashed: WARNING in drm_format_info run #4: crashed: WARNING in drm_format_info run #5: crashed: WARNING in drm_format_info run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in drm_format_info run #8: crashed: WARNING in drm_format_info run #9: crashed: WARNING in drm_format_info run #10: crashed: WARNING in corrupted run #11: crashed: WARNING in drm_format_info run #12: crashed: WARNING in drm_format_info run #13: crashed: WARNING in corrupted run #14: crashed: WARNING in corrupted run #15: crashed: WARNING in drm_format_info run #16: crashed: WARNING in drm_format_info run #17: crashed: WARNING in drm_format_info run #18: crashed: WARNING in corrupted run #19: crashed: WARNING in drm_format_info testing current HEAD b172b44fcb1771e083aad806fa96f3f60e2ddfac testing commit b172b44fcb1771e083aad806fa96f3f60e2ddfac compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a2772b4e07829b5b1fb4ea79660be1bb63f84d69b8cca47dbd593877d9abdb24 run #0: crashed: WARNING in drm_format_info run #1: crashed: WARNING in drm_format_info run #2: crashed: WARNING in drm_format_info run #3: crashed: WARNING in drm_format_info run #4: crashed: WARNING in drm_format_info run #5: crashed: WARNING in drm_format_info run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in drm_format_info run #8: crashed: WARNING in drm_format_info run #9: crashed: WARNING in drm_format_info revisions tested: 2, total time: 26m50.68727088s (build: 19m47.241143435s, test: 6m36.547020672s) the crash still happens on HEAD commit msg: Linux 4.19.206 crash: WARNING in drm_format_info IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready WARNING: CPU: 1 PID: 9889 at drivers/gpu/drm/drm_fourcc.c:204 drm_format_info.part.1+0x10/0x14 drivers/gpu/drm/drm_fourcc.c:204 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9889 Comm: syz-executor.2 Not tainted 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.7+0x1b/0x36 kernel/panic.c:541 report_bug+0x1a1/0x200 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:drm_format_info.part.1+0x10/0x14 drivers/gpu/drm/drm_fourcc.c:204 Code: eb cc 4c 89 ff 48 89 75 d0 e8 fe 5a ff f9 48 8b 75 d0 49 8b 1f e9 4d d6 14 fc 55 48 c7 c7 00 84 5f 88 48 89 e5 e8 4f 4f f6 ff <0f> 0b 5d c3 48 c7 c7 60 89 5f 88 e8 3f 4f f6 ff 0f 0b e9 9e 20 15 RSP: 0018:ffff88808d5878f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffffffff885f88e0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff885023e0 RDI: ffffffff8bad9720 RBP: ffff88808d5878f8 R08: ffffed1017464ea9 R09: ffffed1017464ea8 R10: ffffed1017464ea8 R11: ffff8880ba327547 R12: 0000000000000044 R13: 00000000b0334142 R14: dffffc0000000000 R15: ffff88809b83d6c0 drm_format_info drivers/gpu/drm/drm_fourcc.c:204 [inline] drm_get_format_info drivers/gpu/drm/drm_fourcc.c:228 [inline] drm_get_format_info+0x12d/0x140 drivers/gpu/drm/drm_fourcc.c:219 framebuffer_check drivers/gpu/drm/drm_framebuffer.c:178 [inline] drm_internal_framebuffer_create+0x2b0/0x1080 drivers/gpu/drm/drm_framebuffer.c:303 Bluetooth: hci2: command 0x0419 tx timeout drm_mode_addfb2+0x81/0x2b0 drivers/gpu/drm/drm_framebuffer.c:340 drm_ioctl_kernel+0x1b7/0x240 drivers/gpu/drm/drm_ioctl.c:758 drm_ioctl+0x6be/0xaf0 drivers/gpu/drm/drm_ioctl.c:861 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f789568a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000020000040 RSI: 00000000c06864b8 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd35d1795f R14: 00007f789568a300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..