genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00d00 when write [fee00d00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5902 Comm: syz.3.256 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<8145a1ec>] lr : [<8145a1dc>] psr: 600f0013 sp : dfc81d30 ip : dfc81d30 fp : dfc81d54 r10: 82d2cdd4 r9 : 00000003 r8 : 8334ca80 r7 : dfc81d90 r6 : 8334ca80 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e277a8 r1 : 00000001 r0 : 81459e4c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 857cbe00 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8334ca80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc80000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8334ca80 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 0xdfc80000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfc80000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.3.256 (pid: 5902, stack limit = 0xdfc80000) Stack: (0xdfc81d30 to 0xdfc82000) 1d20: 824bd1ac 8334ca80 00000000 82bd2c7c 1d40: 81e27c68 00000000 dfc81d8c dfc81d58 81455d4c 8145a074 40946400 00000000 1d60: dfc81d7c 20000180 8334ca80 b5403587 40946400 00000003 00000003 8510a580 1d80: dfc81e4c dfc81d90 81451558 81455c50 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000d00 0000001f 00000006 00000fff 00000003 00000cc7 00000000 1dc0: 00000006 00000005 000100ff 00000002 00000001 00000001 00000002 00000009 1de0: 00000003 00000006 00000009 00000042 40000003 00000fff 00000008 00000007 1e00: 02000006 0000800b 00000032 00000005 00000002 0000000d 00000001 ffffff5c 1e20: 00000000 a8b98a8d 00000000 8538f700 8334ca80 20000180 40946400 00000003 1e40: dfc81f14 dfc81e50 8145287c 81451490 00000000 a8b98a8d 00000000 00000000 1e60: 82531804 dfc81ea4 0000005f 843ac7b8 00000064 8334cab0 dfc81ee4 dfc81e88 1e80: 807ea514 807e0828 00000064 00000001 00000000 dfc81ea4 830ec850 834e8660 1ea0: 00006400 0000000b dfc81e98 00000000 00000000 a8b98a8d 00000000 8538f700 1ec0: 40946400 20000180 20000180 8538f700 00000003 8510a580 dfc81ef4 dfc81ee8 1ee0: 807ea648 a8b98a8d dfc81f14 00000000 8538f701 40946400 20000180 8538f700 1f00: 00000003 8510a580 dfc81fa4 dfc81f18 805a1e5c 81452534 ecac8b10 8510a580 1f20: dfc81f3c dfc81f30 81b18b14 81b189e0 dfc81f54 dfc81f40 8025a6bc 8028e2a4 1f40: dfc81fb0 40000000 dfc81f84 dfc81f58 80220be0 8025a678 00000000 82a1c63c 1f60: dfc81fb0 0013e9b0 ecac8b10 80220b34 00000000 a8b98a8d dfc81fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8510a580 00000036 00000000 dfc81fa8 1fa0: 80200060 805a1c24 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc 1fe0: 76f58e88 76f58e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145a068>] (parport_attach) from [<81455d4c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455c44>] (comedi_device_attach) from [<81451558>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8510a580 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334ca80 r4:20000180 [<81451484>] (do_devconfig_ioctl) from [<8145287c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8334ca80 r4:8538f700 [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8510a580 r9:00000003 r8:8538f700 r7:20000180 r6:40946400 r5:8538f701 r4:00000000 [<805a1c18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc81fa8 to 0xdfc81ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc 1fe0: 76f58e88 76f58e78 00018ebc 00130810 r10:00000036 r9:8510a580 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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