genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00800 when write [fee00800] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4716 Comm: syz.0.119 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 : [<814339b4>] lr : [<814339a4>] psr: 60000013 sp : dfc8dd30 ip : dfc8dd30 fp : dfc8dd54 r10: 82b2f064 r9 : 00000003 r8 : 8337ed80 r7 : dfc8dd90 r6 : 8337ed80 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e24a18 r1 : 00000001 r0 : 81433624 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f89e80 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 8337ed80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc8c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8337ed80 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 0xdfc8c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfc8c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.0.119 (pid: 4716, stack limit = 0xdfc8c000) Stack: (0xdfc8dd30 to 0xdfc8e000) dd20: 8244499c 8337ed80 829d6700 829d6700 dd40: 81e24ed8 00000000 dfc8dd8c dfc8dd58 8142f52c 8143384c 40946400 00000000 dd60: dfc8dd7c 20000300 8337ed80 b5403587 40946400 00000003 00000004 8465a400 dd80: dfc8de4c dfc8dd90 8142ad38 8142f42c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000800 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00000010 00000004 00000006 00000002 00000002 00000007 00000001 00000006 dde0: 10000105 00000000 0001244d 00000003 3fff7fff 00000089 00000010 00000001 de00: 20001e58 0080000b 00000007 00000008 00000008 00000006 ffffffff effffff8 de20: 00000000 04eb3e5b 00000000 833780c0 8337ed80 20000300 40946400 00000003 de40: dfc8df14 dfc8de50 8142c05c 8142ac70 00000000 04eb3e5b 00000000 00000000 de60: 824b857c dfc8dea4 0000005f 842be640 00000064 8337edb0 dfc8dee4 dfc8de88 de80: 807cf200 807c55d8 00000064 00000001 00000000 dfc8dea4 85ec7d90 83434b28 dea0: 00006400 0000000b dfc8de98 00000000 00000000 04eb3e5b 00000000 833780c0 dec0: 40946400 20000300 20000300 833780c0 00000004 8465a400 dfc8def4 dfc8dee8 dee0: 807cf330 04eb3e5b dfc8df14 00000000 833780c1 40946400 20000300 833780c0 df00: 00000004 8465a400 dfc8dfa4 dfc8df18 805906a8 8142bd14 ecac8b10 8465a400 df20: dfc8df3c dfc8df30 81ae4734 81ae4600 dfc8df54 dfc8df40 8025a824 8028c290 df40: dfc8dfb0 40000000 dfc8df84 dfc8df58 80220bf8 8025a7e0 00000000 8281d2bc df60: dfc8dfb0 0013e480 ecac8b10 80220b4c 00000000 04eb3e5b dfc8dfac 00000000 df80: 00000000 00346310 00000036 8020029c 8465a400 00000036 00000000 dfc8dfa8 dfa0: 80200060 80590470 00000000 00000000 00000004 40946400 20000300 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f370dc dfe0: 76f36e88 76f36e78 00018ba0 001302e0 60000010 00000004 00000000 00000000 Call trace: [<81433840>] (parport_attach) from [<8142f52c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24ed8 r4:829d6700 [<8142f420>] (comedi_device_attach) from [<8142ad38>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8465a400 r9:00000004 r8:00000003 r7:40946400 r6:b5403587 r5:8337ed80 r4:20000300 [<8142ac64>] (do_devconfig_ioctl) from [<8142c05c>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000300 r5:8337ed80 r4:833780c0 [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8465a400 r9:00000004 r8:833780c0 r7:20000300 r6:40946400 r5:833780c1 r4:00000000 [<80590464>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc8dfa8 to 0xdfc8dff0) dfa0: 00000000 00000000 00000004 40946400 20000300 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f370dc dfe0: 76f36e88 76f36e78 00018ba0 001302e0 r10:00000036 r9:8465a400 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