genirq: Flags mismatch irq 32. 00200001 (comedi_parport) vs. 00200081 (virtio1) 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: 17448 Comm: syz.4.2631 Not tainted syzkaller #0 PREEMPT 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 : [<813ce490>] lr : [<813ce480>] psr: 60000013 sp : dfb51d30 ip : dfb51d30 fp : dfb51d54 r10: 82b25910 r9 : 00000003 r8 : 842b9000 r7 : dfb51d90 r6 : 842b9000 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1773c r1 : 00000001 r0 : 813ce100 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85b948c0 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 842b9000 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 842b9000 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 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.4.2631 (pid: 17448, stack limit = 0xdfb50000) Stack: (0xdfb51d30 to 0xdfb52000) 1d20: 823f12b8 842b9000 829d1bf4 829d1bf4 1d40: 81e17bfc 842b9044 dfb51d8c dfb51d58 813ca520 813ce328 200000c0 00000000 1d60: dfb51d7c 200000c0 842b9000 b5403587 200000c0 86611800 40946400 00000003 1d80: dfb51e4c dfb51d90 813c606c 813ca424 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000020 00010000 10000004 00000008 ffeffbf9 00000008 1dc0: 40000000 04800000 00100100 fffffff9 00000001 00000004 fffffffe 00000403 1de0: 0000000f fffffffc 00000000 00000003 40000003 00000089 fffffffd 00000000 1e00: 20001e55 0400000b 00000fff 00000001 00000008 00000007 08000000 00000001 1e20: 00000000 b48ae9f1 00000000 85b0c240 842b9000 200000c0 200000c0 86611800 1e40: dfb51f14 dfb51e50 813c7038 813c5f78 00000000 00000000 00000000 b48ae9f1 1e60: 00000000 00000000 824625b4 0000005f 84274a30 842b9030 8424f63c 86611800 1e80: dfb51ee4 dfb51e90 807a779c 8079db94 00000064 00000001 00000000 dfb51eac 1ea0: 84d793d0 834e04c8 00006400 0000000b dfb51ea0 00000000 00000000 b48ae9f1 1ec0: 85b0c240 40946400 200000c0 200000c0 85b0c240 00000003 dfb51ef4 dfb51ee8 1ee0: 807a78bc b48ae9f1 dfb51f14 40946400 00000000 85b0c241 200000c0 85b0c240 1f00: 00000003 86611800 dfb51fa4 dfb51f18 805789d0 813c6a68 ecac8b10 86611800 1f20: dfb51f3c dfb51f30 81a608b8 81a60788 dfb51f54 dfb51f40 8025c484 8028d914 1f40: dfb51fb0 40000000 dfb51f84 dfb51f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfb51fb0 0014ced0 ecac8b10 80222940 00000000 b48ae9f1 dfb51fac 00000000 1f80: 00000000 00316308 00000036 8020029c 86611800 00000036 00000000 dfb51fa8 1fa0: 80200060 805788ac 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fcb0bc 1fe0: 76fcaec0 76fcaeb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce31c>] (parport_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:842b9044 r5:81e17bfc r4:829d1bf4 [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:86611800 r7:200000c0 r6:b5403587 r5:842b9000 r4:200000c0 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:86611800 r7:200000c0 r6:200000c0 r5:842b9000 r4:85b0c240 [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:86611800 r9:00000003 r8:85b0c240 r7:200000c0 r6:85b0c241 r5:00000000 r4:40946400 [<805788a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb51fa8 to 0xdfb51ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fcb0bc 1fe0: 76fcaec0 76fcaeb0 0001928c 00132970 r10:00000036 r9:86611800 r8:8020029c r7:00000036 r6:00316308 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