(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). (lotsa cc's added) On Mon, 9 Nov 2009 08:59:05 GMT bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=14564 > > Summary: capture-example sleeping function called from invalid > context at arch/x86/mm/fault.c > Product: Memory Management > Version: 2.5 > Kernel Version: 2.6.31.5 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: high > Priority: P1 > Component: Slab Allocator > AssignedTo: akpm@xxxxxxxxxxxxxxxxxxxx > ReportedBy: knife@xxxxxxxxxxx > Regression: No > Thhis is odd. > On a DM&P ebox2300sx, 300Mhz Vortex86 cpu, I have a vanilla 2.6.31.5 kernel > with a pac207 webcam. I run capture-example from the v4l-dvb sample > applications and it crashes 1 out of 5 times. Let me know if I need to collect > more data or try anything. > > [root@X-Linux]:~ # capture-example > ......................................................................BUG: > sleeping function called from invalid context at arch/x86/mm/fault.c:1069 > in_atomic(): 0, irqs_disabled(): 1, pid: 1178, name: capture-example > 4 locks held by capture-example/1178: > #0: (&gspca_dev->queue_lock){+.+.+.}, at: [<c8872eda>] > vidioc_streamoff+0x3b/0xb4 [gspca_main] > #1: (&gspca_dev->usb_lock){+.+.+.}, at: [<c8872eed>] > vidioc_streamoff+0x4e/0xb4 [gspca_main] > #2: (&ohci->lock){-.-...}, at: [<c11c8093>] ohci_endpoint_disable+0x31/0x192 > #3: (&mm->mmap_sem){++++++}, at: [<c100c168>] do_page_fault+0xc1/0x1fe > irq event stamp: 11656 > hardirqs last enabled at (11655): [<c12e41a0>] _spin_unlock_irq+0x22/0x26 > hardirqs last disabled at (11656): [<c12e41da>] _spin_lock_irqsave+0x10/0x5a > softirqs last enabled at (11610): [<c101a87f>] __do_softirq+0x145/0x14d > softirqs last disabled at (11605): [<c101a8b1>] do_softirq+0x2a/0x42 > Pid: 1178, comm: capture-example Not tainted 2.6.31.5 #2 > Call Trace: > [<c101222d>] __might_sleep+0xcb/0xd0 > [<c100c1ad>] do_page_fault+0x106/0x1fe > [<c100c0a7>] ? do_page_fault+0x0/0x1fe > [<c12e43c3>] error_code+0x63/0x70 > [<c100c0a7>] ? do_page_fault+0x0/0x1fe > [<c11c5cef>] ? td_free+0x23/0x75 > [<c11c8175>] ohci_endpoint_disable+0x113/0x192 > [<c11b4428>] usb_hcd_disable_endpoint+0x2e/0x32 > [<c11b5b3f>] usb_disable_endpoint+0x6d/0x72 > [<c11b5cae>] usb_disable_interface+0x30/0x3f > [<c11b70ac>] usb_set_interface+0x11b/0x1a0 > [<c8872e1d>] gspca_set_alt0+0x23/0x46 [gspca_main] > [<c8872e75>] gspca_stream_off+0x35/0x5f [gspca_main] > [<c8872ef8>] vidioc_streamoff+0x59/0xb4 [gspca_main] > [<c8817244>] __video_do_ioctl+0x17af/0x3920 [videodev] > [<c1032fa1>] ? __lock_acquire+0x6ef/0x755 > [<c102f436>] ? lock_release_holdtime+0x81/0x86 > [<c103315c>] ? lock_release_non_nested+0xab/0x1cf > [<c105382f>] ? might_fault+0x3d/0x79 > [<c105382f>] ? might_fault+0x3d/0x79 > [<c11123d4>] ? copy_from_user+0x31/0x54 > [<c88196b8>] video_ioctl2+0x303/0x3ea [videodev] > [<c102f436>] ? lock_release_holdtime+0x81/0x86 > [<c12e430e>] ? _spin_unlock_irqrestore+0x36/0x3c > [<c103086c>] ? trace_hardirqs_on_caller+0x104/0x12b > [<c103089e>] ? trace_hardirqs_on+0xb/0xd > [<c88193b5>] ? video_ioctl2+0x0/0x3ea [videodev] > [<c88156d8>] v4l2_unlocked_ioctl+0x2e/0x32 [videodev] > [<c88156aa>] ? v4l2_unlocked_ioctl+0x0/0x32 [videodev] > [<c106dd91>] vfs_ioctl+0x19/0x50 > [<c106e36b>] do_vfs_ioctl+0x458/0x4a3 > [<c1155a42>] ? tty_ldisc_deref+0x8/0xa > [<c1150c1c>] ? tty_write+0x1b1/0x1c2 > [<c1152d69>] ? n_tty_write+0x0/0x2e6 > [<c1150a6b>] ? tty_write+0x0/0x1c2 > [<c106431d>] ? vfs_write+0xe3/0xfa > [<c1002858>] ? restore_all_notrace+0x0/0x18 > [<c106e3e2>] sys_ioctl+0x2c/0x45 > [<c1002825>] syscall_call+0x7/0xb We oopsed in td_free() (see below). But as part of that oops processing the kernel entered do_page_fault() and emitted a might_sleep() warning because we took a pagefault with local interrupts disabled. This is undesirable behaviour from the low-level x86 fault code and I don't think it normally happens. Did we break something in x86 land, or is this oops sufficiently weird and whacky to bypass existing checks for this false positive? > BUG: unable to handle kernel paging request at a7a7a7c3 > IP: [<c11c5cef>] td_free+0x23/0x75 > *pde = 00000000 > Oops: 0000 [#1] DEBUG_PAGEALLOC > last sysfs file: > Modules linked in: gspca_pac207 gspca_main videodev v4l1_compat > > Pid: 1178, comm: capture-example Not tainted (2.6.31.5 #2) > EIP: 0060:[<c11c5cef>] EFLAGS: 00000083 CPU: 0 > EIP is at td_free+0x23/0x75 > EAX: a7a7a7a7 EBX: c6b35bf0 ECX: c6b35ce4 EDX: a7a7a7c3 > ESI: c6b7d800 EDI: c6b35cd4 EBP: c6785cc4 ESP: c6785cb8 > DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 > Process capture-example (pid: 1178, ti=c6784000 task=c678d338 task.ti=c6784000) > Stack: > c6b35bf0 000003e8 c6b35cd4 c6785cf0 c11c8175 c6ba2ea0 c6b35bf0 00000000 > <0> c6b35bf0 00000292 c6b7c040 c6b35bf0 c6ba2ea0 c6b99ed8 c6785d00 c11b4428 > <0> c6b32bf0 c6ba2ea0 c6785d14 c11b5b3f 01ba3df0 000000dc 00000005 c6785d30 > Call Trace: > [<c11c8175>] ? ohci_endpoint_disable+0x113/0x192 > [<c11b4428>] ? usb_hcd_disable_endpoint+0x2e/0x32 > [<c11b5b3f>] ? usb_disable_endpoint+0x6d/0x72 > [<c11b5cae>] ? usb_disable_interface+0x30/0x3f > [<c11b70ac>] ? usb_set_interface+0x11b/0x1a0 > [<c8872e1d>] ? gspca_set_alt0+0x23/0x46 [gspca_main] > [<c8872e75>] ? gspca_stream_off+0x35/0x5f [gspca_main] > [<c8872ef8>] ? vidioc_streamoff+0x59/0xb4 [gspca_main] > [<c8817244>] ? __video_do_ioctl+0x17af/0x3920 [videodev] > [<c1032fa1>] ? __lock_acquire+0x6ef/0x755 > [<c102f436>] ? lock_release_holdtime+0x81/0x86 > [<c103315c>] ? lock_release_non_nested+0xab/0x1cf > [<c105382f>] ? might_fault+0x3d/0x79 > [<c105382f>] ? might_fault+0x3d/0x79 > [<c11123d4>] ? copy_from_user+0x31/0x54 > [<c88196b8>] ? video_ioctl2+0x303/0x3ea [videodev] > [<c102f436>] ? lock_release_holdtime+0x81/0x86 > [<c12e430e>] ? _spin_unlock_irqrestore+0x36/0x3c > [<c103086c>] ? trace_hardirqs_on_caller+0x104/0x12b > [<c103089e>] ? trace_hardirqs_on+0xb/0xd > [<c88193b5>] ? video_ioctl2+0x0/0x3ea [videodev] > [<c88156d8>] ? v4l2_unlocked_ioctl+0x2e/0x32 [videodev] > [<c88156aa>] ? v4l2_unlocked_ioctl+0x0/0x32 [videodev] > [<c106dd91>] ? vfs_ioctl+0x19/0x50 > [<c106e36b>] ? do_vfs_ioctl+0x458/0x4a3 > [<c1155a42>] ? tty_ldisc_deref+0x8/0xa > [<c1150c1c>] ? tty_write+0x1b1/0x1c2 > [<c1152d69>] ? n_tty_write+0x0/0x2e6 > [<c1150a6b>] ? tty_write+0x0/0x1c2 > [<c106431d>] ? vfs_write+0xe3/0xfa > [<c1002858>] ? restore_all_notrace+0x0/0x18 > [<c106e3e2>] ? sys_ioctl+0x2c/0x45 > [<c1002825>] ? syscall_call+0x7/0xb > Code: e5 e8 bf 7b e9 ff 5d c3 55 89 e5 57 89 c7 56 89 d6 53 8b 42 28 89 c2 c1 > ea 06 31 d0 83 e0 3f 8d 94 87 cc 00 00 00 eb 03 8d 50 1c <8b> 02 85 c0 74 0b 39 > EIP: [<c11c5cef>] td_free+0x23/0x75 SS:ESP 0068:c6785cb8 > CR2: 00000000a7a7a7c3 And here's the real oops. drivers/usb/host/ohci-mem.c:td_free() dereferenced a7a7a7c3. Which looks like /********** drivers/base/dmapool.c **********/ #define POOL_POISON_FREED 0xa7 /* !inuse */ #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
