genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7769 Comm: syz.2.993 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81432c7c>] lr : [<81432c6c>] psr: 600f0013 sp : dfcddd30 ip : dfcddd30 fp : dfcddd54 r10: 82b2efdc r9 : 00000003 r8 : 846366c0 r7 : dfcddd90 r6 : 846366c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24918 r1 : 00000001 r0 : 814328ec Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85dd1700 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 846366c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 846366c0 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.2.993 (pid: 7769, stack limit = 0xdfcdc000) Stack: (0xdfcddd30 to 0xdfcde000) dd20: 8244454c 846366c0 829d66c0 829d66c0 dd40: 81e24dd8 00000000 dfcddd8c dfcddd58 8142e7f0 81432b14 40946400 00000000 dd60: dfcddd7c 200000c0 846366c0 b5403587 40946400 00000003 00000003 8398ec00 dd80: dfcdde4c dfcddd90 81429ffc 8142e6f0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 dde0: 10000105 00000000 0001a44d 00000003 3fff7fff 0000008a 00000010 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 ffffffff effffff8 de20: 00000000 3f70ad44 00000000 852e9a80 846366c0 200000c0 40946400 00000003 de40: dfcddf14 dfcdde50 8142b320 81429f34 dfcdde4c 3f70ad44 00000000 00000000 de60: 824b857c dfcddea4 0000005f 84203600 00000064 846366f0 dfcddee4 dfcdde88 de80: 807cf048 807c5420 00000064 00000001 00000000 dfcddea4 830cd190 834dd990 dea0: 00006400 0000000b dfcdde98 00000000 dfcddd38 3f70ad44 00000000 852e9a80 dec0: 40946400 200000c0 200000c0 852e9a80 00000003 8398ec00 dfcddef4 dfcddee8 dee0: 807cf178 3f70ad44 dfcddf14 00000000 852e9a81 40946400 200000c0 852e9a80 df00: 00000003 8398ec00 dfcddfa4 dfcddf18 80590510 8142afd8 ecac8b10 8398ec00 df20: dfcddf3c dfcddf30 81ae3934 81ae3800 dfcddf54 dfcddf40 8025a824 8028c290 df40: dfcddfb0 40000000 dfcddf84 dfcddf58 80220bf8 8025a7e0 00000000 8281d2bc df60: dfcddfb0 0013e480 ecac8b10 80220b4c 00000000 3f70ad44 dfcddfac 00000000 df80: 00000000 00346310 00000036 8020029c 8398ec00 00000036 00000000 dfcddfa8 dfa0: 80200060 805902d8 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc dfe0: 76f58e88 76f58e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81432b08>] (parport_attach) from [<8142e7f0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d66c0 [<8142e6e4>] (comedi_device_attach) from [<81429ffc>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8398ec00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846366c0 r4:200000c0 [<81429f28>] (do_devconfig_ioctl) from [<8142b320>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:846366c0 r4:852e9a80 [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142afcc>] (comedi_unlocked_ioctl) from [<80590510>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8398ec00 r9:00000003 r8:852e9a80 r7:200000c0 r6:40946400 r5:852e9a81 r4:00000000 [<805902cc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcddfa8 to 0xdfcddff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc dfe0: 76f58e88 76f58e78 00018ba0 001302e0 r10:00000036 r9:8398ec00 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction