Hello,
Hit the following oops while fuzzing the kernel with Trinity in a qemu virtual machine:
[ 2143.140647] BUG: unable to handle kernel paging request at ffffc90000669000 [ 2143.140652] IP: [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.140654] PGD 3e073067 PUD 3e074067 PMD 3ca84067 PTE 0 [ 2143.140656] Oops: 0002 [#1] SMP [ 2143.140660] CPU 0 [ 2143.140660] Pid: 2894, comm: trinity-child0 Not tainted 3.8.0-rc7+ #86 Bochs Bochs [ 2143.140662] RIP: 0010:[<ffffffff8139d84a>] [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.140663] RSP: 0018:ffff88003a967888 EFLAGS: 00010246 [ 2143.140664] RAX: 0000000003fffe1f RBX: 0000000000000000 RCX: 0000000000000008 [ 2143.140664] RDX: 0000000003f87fff RSI: ffffc900002a9f08 RDI: 0000000000000000 [ 2143.140665] RBP: ffff88003a9678a8 R08: 0000000000000008 R09: 0000000000000010 [ 2143.140666] R10: ffffc90000668fe8 R11: 0000000000000000 R12: 00000000ffff8800 [ 2143.140666] R13: 00000000ffffffc0 R14: ffffffffffffffff R15: 0000000000000018 [ 2143.140668] FS: 00007f965fc5e700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 [ 2143.140668] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2143.140669] CR2: ffffc90000669000 CR3: 0000000039c50000 CR4: 00000000000006f0 [ 2143.140675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2143.140678] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 2143.140679] Process trinity-child0 (pid: 2894, threadinfo ffff88003a966000, task ffff88003b0c0000) [ 2143.140679] Stack: [ 2143.140682] ffff88003ca8d800 0000000000000000 ffffc900002a9f00 0000000000000000 [ 2143.140683] ffff88003a967938 ffffffff8139debf ffffffffffff8800 ffff880000000040 [ 2143.140685] ffffffff8225f1a0 ffff000000000000 ffff88003a9678e8 ffffffff810f5aed [ 2143.140685] Call Trace: [ 2143.140688] [<ffffffff8139debf>] sys_fillrect+0x34f/0x370 [ 2143.140692] [<ffffffff810f5aed>] ? trace_hardirqs_on+0xd/0x10 [ 2143.140693] [<ffffffff8139d740>] ? bitfill_aligned+0x120/0x120 [ 2143.140696] [<ffffffff814bbcef>] cirrus_fillrect+0x1f/0x40 [ 2143.140697] [<ffffffff8139aaba>] bit_clear_margins+0x12a/0x170 [ 2143.140701] [<ffffffff81395641>] fbcon_clear_margins+0x71/0x80 [ 2143.140702] [<ffffffff813998a9>] fbcon_switch+0x479/0x540 [ 2143.140705] [<ffffffff814166c1>] redraw_screen+0x131/0x250 [ 2143.140707] [<ffffffff81396c1c>] fbcon_modechanged+0x18c/0x210 [ 2143.140709] [<ffffffff81397739>] fbcon_event_notify+0x1f9/0x850 [ 2143.140712] [<ffffffff810c671d>] notifier_call_chain+0xbd/0xf0 [ 2143.140714] [<ffffffff810c6c08>] __blocking_notifier_call_chain+0x98/0xc0 [ 2143.140716] [<ffffffff810c6c41>] blocking_notifier_call_chain+0x11/0x20 [ 2143.140718] [<ffffffff81389146>] fb_notifier_call_chain+0x16/0x20 [ 2143.140720] [<ffffffff8138ae19>] fb_set_var+0x439/0x480 [ 2143.140721] [<ffffffff8138b089>] do_fb_ioctl+0x189/0x5d0 [ 2143.140723] [<ffffffff810f5bcd>] ? trace_hardirqs_off+0xd/0x10 [ 2143.140724] [<ffffffff810d552a>] ? local_clock+0x4a/0x70 [ 2143.140726] [<ffffffff810f1e98>] ? lock_release_holdtime+0x28/0x170 [ 2143.140728] [<ffffffff8138b90a>] fb_ioctl+0x3a/0x40 [ 2143.140731] [<ffffffff811b5ff2>] do_vfs_ioctl+0x532/0x580 [ 2143.140735] [<ffffffff812fc7d3>] ? file_has_perm+0x83/0xa0 [ 2143.140737] [<ffffffff811b609d>] sys_ioctl+0x5d/0xa0 [ 2143.140739] [<ffffffff813571de>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 2143.140741] [<ffffffff81ca06e9>] system_call_fastpath+0x16/0x1b [ 2143.140758] Code: 89 7a 08 48 d3 e3 44 89 c9 48 d3 ef 44 89 c1 48 09 df 48 89 fb 49 89 7a 10 48 d3 e3 44 89 c9 48 d3 ef 44 89 c1 48 09 df 48 89 fb <49> 89 7a 18 49 83 c2 20 48 d3 e3 44 89 c9 48 d3 ef 48 09 df 83 [ 2143.140760] RIP [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.140760] RSP <ffff88003a967888> [ 2143.140761] CR2: ffffc90000669000 [ 2143.146366] BUG: unable to handle kernel paging request at ffffc90000669000 [ 2143.146369] IP: [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.146371] PGD 3e073067 PUD 3e074067 PMD 3ca84067 PTE 0 [ 2143.146372] Oops: 0002 [#2] SMP [ 2143.146375] CPU 0 [ 2143.146375] Pid: 2894, comm: trinity-child0 Not tainted 3.8.0-rc7+ #86 Bochs Bochs [ 2143.146377] RIP: 0010:[<ffffffff8139d84a>] [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.146378] RSP: 0018:ffff88003a967218 EFLAGS: 00010246 [ 2143.146378] RAX: 0000000003fffe1f RBX: 0000000000000000 RCX: 0000000000000008 [ 2143.146379] RDX: 0000000003f87fff RSI: ffffc900002a9f08 RDI: 0000000000000000 [ 2143.146380] RBP: ffff88003a967238 R08: 0000000000000008 R09: 0000000000000010 [ 2143.146380] R10: ffffc90000668fe8 R11: 0000000000000000 R12: 00000000ffff8800 [ 2143.146381] R13: 00000000ffffffc0 R14: ffffffffffffffff R15: 0000000000000018 [ 2143.146382] FS: 00007f965fc5e700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 [ 2143.146383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2143.146383] CR2: ffffc90000669000 CR3: 0000000039c50000 CR4: 00000000000006f0 [ 2143.146388] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2143.146391] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 2143.146391] Process trinity-child0 (pid: 2894, threadinfo ffff88003a966000, task ffff88003b0c0000) [ 2143.146392] Stack: [ 2143.146394] ffff88003ca8d800 0000000000000000 ffffc900002a9f00 0000000000000000 [ 2143.146395] ffff88003a9672c8 ffffffff8139debf ffffffffffff8800 ffff880000000040 [ 2143.146397] ffffffff8225f1a0 ffff000000000000 ffff88003a967278 ffffffff810f5aed [ 2143.146397] Call Trace: [ 2143.146399] [<ffffffff8139debf>] sys_fillrect+0x34f/0x370 [ 2143.146402] [<ffffffff810f5aed>] ? trace_hardirqs_on+0xd/0x10 [ 2143.146403] [<ffffffff8139d740>] ? bitfill_aligned+0x120/0x120 [ 2143.146405] [<ffffffff814bbcef>] cirrus_fillrect+0x1f/0x40 [ 2143.146406] [<ffffffff8139aaba>] bit_clear_margins+0x12a/0x170 [ 2143.146408] [<ffffffff81395641>] fbcon_clear_margins+0x71/0x80 [ 2143.146410] [<ffffffff813998a9>] fbcon_switch+0x479/0x540 [ 2143.146412] [<ffffffff814166c1>] redraw_screen+0x131/0x250 [ 2143.146414] [<ffffffff81397f9a>] fbcon_blank+0x20a/0x2d0 [ 2143.146417] [<ffffffff81c9effc>] ? _raw_spin_lock_irqsave+0x7c/0x90 [ 2143.146420] [<ffffffff810a8ee3>] ? lock_timer_base.isra.25+0x33/0x70 [ 2143.146422] [<ffffffff810f5b18>] ? trace_hardirqs_off_caller+0x28/0xd0 [ 2143.146423] [<ffffffff810f5bcd>] ? trace_hardirqs_off+0xd/0x10 [ 2143.146425] [<ffffffff81c9f174>] ? _raw_spin_unlock_irqrestore+0x44/0x70 [ 2143.146427] [<ffffffff810aa17b>] ? mod_timer+0x1ab/0x200 [ 2143.146429] [<ffffffff814180f8>] do_unblank_screen+0xf8/0x1d0 [ 2143.146430] [<ffffffff814181db>] unblank_screen+0xb/0x10 [ 2143.146432] [<ffffffff81358239>] bust_spinlocks+0x19/0x30 [ 2143.146435] [<ffffffff8105cde2>] oops_end+0x42/0xe0 [ 2143.146438] [<ffffffff81c89d82>] no_context+0x253/0x27e [ 2143.146439] [<ffffffff81c89f73>] __bad_area_nosemaphore+0x1c6/0x1e5 [ 2143.146442] [<ffffffff81091681>] ? kmemcheck_pte_lookup+0x11/0x40 [ 2143.146444] [<ffffffff81c89fa0>] bad_area_nosemaphore+0xe/0x10 [ 2143.146445] [<ffffffff8108a35e>] __do_page_fault+0x43e/0x4d0 [ 2143.146447] [<ffffffff810f58d3>] ? mark_held_locks+0x123/0x140 [ 2143.146449] [<ffffffff81c9fdb3>] ? retint_restore_args+0x13/0x13 [ 2143.146451] [<ffffffff810f58d3>] ? mark_held_locks+0x123/0x140 [ 2143.146452] [<ffffffff8135721d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 2143.146454] [<ffffffff8108a419>] do_page_fault+0x9/0x10 [ 2143.146456] [<ffffffff8108492c>] do_async_page_fault+0x4c/0xa0 [ 2143.146458] [<ffffffff81ca00b8>] async_page_fault+0x28/0x30 [ 2143.146459] [<ffffffff8139d84a>] ? bitfill_unaligned+0x10a/0x1a0 [ 2143.146460] [<ffffffff8139debf>] sys_fillrect+0x34f/0x370 [ 2143.146462] [<ffffffff810f5aed>] ? trace_hardirqs_on+0xd/0x10 [ 2143.146464] [<ffffffff8139d740>] ? bitfill_aligned+0x120/0x120 [ 2143.146465] [<ffffffff814bbcef>] cirrus_fillrect+0x1f/0x40 [ 2143.146466] [<ffffffff8139aaba>] bit_clear_margins+0x12a/0x170 [ 2143.146468] [<ffffffff81395641>] fbcon_clear_margins+0x71/0x80 [ 2143.146470] [<ffffffff813998a9>] fbcon_switch+0x479/0x540 [ 2143.146472] [<ffffffff814166c1>] redraw_screen+0x131/0x250 [ 2143.146473] [<ffffffff81396c1c>] fbcon_modechanged+0x18c/0x210 [ 2143.146475] [<ffffffff81397739>] fbcon_event_notify+0x1f9/0x850 [ 2143.146477] [<ffffffff810c671d>] notifier_call_chain+0xbd/0xf0 [ 2143.146479] [<ffffffff810c6c08>] __blocking_notifier_call_chain+0x98/0xc0 [ 2143.146481] [<ffffffff810c6c41>] blocking_notifier_call_chain+0x11/0x20 [ 2143.146483] [<ffffffff81389146>] fb_notifier_call_chain+0x16/0x20 [ 2143.146484] [<ffffffff8138ae19>] fb_set_var+0x439/0x480 [ 2143.146486] [<ffffffff8138b089>] do_fb_ioctl+0x189/0x5d0 [ 2143.146487] [<ffffffff810f5bcd>] ? trace_hardirqs_off+0xd/0x10 [ 2143.146488] [<ffffffff810d552a>] ? local_clock+0x4a/0x70 [ 2143.146490] [<ffffffff810f1e98>] ? lock_release_holdtime+0x28/0x170 [ 2143.146492] [<ffffffff8138b90a>] fb_ioctl+0x3a/0x40 [ 2143.146494] [<ffffffff811b5ff2>] do_vfs_ioctl+0x532/0x580 [ 2143.146496] [<ffffffff812fc7d3>] ? file_has_perm+0x83/0xa0 [ 2143.146498] [<ffffffff811b609d>] sys_ioctl+0x5d/0xa0 [ 2143.146499] [<ffffffff813571de>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 2143.146501] [<ffffffff81ca06e9>] system_call_fastpath+0x16/0x1b [ 2143.146518] Code: 89 7a 08 48 d3 e3 44 89 c9 48 d3 ef 44 89 c1 48 09 df 48 89 fb 49 89 7a 10 48 d3 e3 44 89 c9 48 d3 ef 44 89 c1 48 09 df 48 89 fb <49> 89 7a 18 49 83 c2 20 48 d3 e3 44 89 c9 48 d3 ef 48 09 df 83 [ 2143.146519] RIP [<ffffffff8139d84a>] bitfill_unaligned+0x10a/0x1a0 [ 2143.146520] RSP <ffff88003a967218> [ 2143.146520] CR2: ffffc90000669000 [ 2143.146522] ---[ end trace bc6146191d8a6170 ]---
Tommi