Hello,
syzbot found the following crash on:
HEAD commit: 1fc1cd8399ab Merge branch 'for-5.1' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10dab41b200000 kernel config: https://syzkaller.appspot.com/x/.config?x=83f72881c3c30b7c dashboard link: https://syzkaller.appspot.com/bug?extid=03bd8ee354763fad396d compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15186357200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1502c533200000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+03bd8ee354763fad396d@syzkaller.appspotmail.com
kauditd_printk_skb: 3 callbacks suppressed audit: type=1400 audit(1552001909.747:35): avc: denied { map } for pid=8034 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1552001916.317:36): avc: denied { map } for pid=8046 comm="syz-executor642" path="/root/syz-executor642773801" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 WARNING: CPU: 0 PID: 8046 at kernel/workqueue.c:3020 __flush_work+0x74c/0x8a0 kernel/workqueue.c:3020 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8046 Comm: syz-executor642 Not tainted 5.0.0+ #11 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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:__flush_work+0x74c/0x8a0 kernel/workqueue.c:3020 Code: 74 58 e8 77 12 26 00 fb 66 0f 1f 44 00 00 45 31 e4 e9 86 fd ff ff e8 63 12 26 00 0f 0b 45 31 e4 e9 77 fd ff ff e8 54 12 26 00 <0f> 0b 45 31 e4 e9 68 fd ff ff e8 45 12 26 00 4c 89 ff 45 31 e4 e8 RSP: 0018:ffff888087e6f608 EFLAGS: 00010293 RAX: ffff888098292340 RBX: ffff8880a623f000 RCX: ffffffff814a14cb RDX: 0000000000000000 RSI: ffffffff814a1b7c RDI: 0000000000000001 RBP: ffff888087e6f778 R08: ffff888098292340 R09: ffffed1010fcdedd R10: ffffed1010fcdedc R11: 0000000000000003 R12: dffffc0000000000 R13: ffff888087e6f750 R14: 0000000000000000 R15: 0000000000000001 flush_work+0x18/0x20 kernel/workqueue.c:3050 vkms_atomic_crtc_destroy_state drivers/gpu/drm/vkms/vkms_crtc.c:133 [inline] vkms_atomic_crtc_destroy_state+0x2d/0x40 drivers/gpu/drm/vkms/vkms_crtc.c:125 drm_atomic_state_default_clear+0x37c/0xd60 drivers/gpu/drm/drm_atomic.c:171 drm_atomic_state_clear+0x9d/0xc0 drivers/gpu/drm/drm_atomic.c:240 __drm_atomic_state_free+0x3c/0xf0 drivers/gpu/drm/drm_atomic.c:256 kref_put include/linux/kref.h:67 [inline] drm_atomic_state_put include/drm/drm_atomic.h:385 [inline] drm_atomic_helper_set_config+0xe5/0x160 drivers/gpu/drm/drm_atomic_helper.c:2956 drm_mode_setcrtc+0x613/0x1490 drivers/gpu/drm/drm_crtc.c:748 drm_ioctl_kernel+0x23b/0x2e0 drivers/gpu/drm/drm_ioctl.c:758 drm_ioctl+0x545/0xa50 drivers/gpu/drm/drm_ioctl.c:858 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443de9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffef4b0a4f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443de9 RDX: 0000000020000000 RSI: 00000000c06864a2 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401af0 R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..
--- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches