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: 10243 Comm: syz.2.843 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 : [<81431654>] lr : [<81431644>] psr: 60000013 sp : ea871d30 ip : ea871d30 fp : ea871d54 r10: 82b2efdc r9 : 00000003 r8 : 833a09c0 r7 : ea871d90 r6 : 833a09c0 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e24918 r1 : 00000001 r0 : 814312c4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85e0ccc0 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 833a09c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea870000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 833a09c0 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 0xea870000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xea870000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.2.843 (pid: 10243, stack limit = 0xea870000) Stack: (0xea871d30 to 0xea872000) 1d20: 82444268 833a09c0 ea871d58 829d6640 1d40: 81e24dd8 00000000 ea871d8c ea871d58 8142d1c8 814314ec 40946400 00000000 1d60: ea871d7c 20000300 833a09c0 b5403587 40946400 00000003 00000004 84fe8000 1d80: ea871e4c ea871d90 814289d4 8142d0c8 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000800 0000001f 00010000 00000004 00000003 00000cc7 00000004 1dc0: 00000010 0000000e 00000006 00000002 00000002 00000007 00000001 00000006 1de0: 10000105 00000000 0001244d 00000003 3fff7fff 00000089 00000010 00000001 1e00: 20001e58 0080000b 00000e6c 00000008 00000008 00000006 ffffffff effffff8 1e20: 00000000 60687ee9 00000000 838f29c0 833a09c0 20000300 40946400 00000003 1e40: ea871f14 ea871e50 81429cf8 8142890c 00000000 60687ee9 00000000 00000000 1e60: 824b857c ea871ea4 0000005f 844dae20 00000064 833a09f0 ea871ee4 ea871e88 1e80: 807cdc80 807c4058 00000064 00000001 00000000 ea871ea4 830cd0d0 834253b8 1ea0: 00006400 0000000b ea871e98 00000000 00000000 60687ee9 00000000 838f29c0 1ec0: 40946400 20000300 20000300 838f29c0 00000004 84fe8000 ea871ef4 ea871ee8 1ee0: 807cddb0 60687ee9 ea871f14 00000000 838f29c1 40946400 20000300 838f29c0 1f00: 00000004 84fe8000 ea871fa4 ea871f18 8058fb90 814299b0 ecac8b10 84fe8000 1f20: ea871f3c ea871f30 81ae1d14 81ae1be0 ea871f54 ea871f40 8025a868 8028c368 1f40: ea871fb0 40000000 ea871f84 ea871f58 80220bf8 8025a824 00000000 8281d2bc 1f60: ea871fb0 0013e480 ecac8b10 80220b4c 00000000 60687ee9 ea871fac 00000000 1f80: 00000000 003463b0 00000036 8020029c 84fe8000 00000036 00000000 ea871fa8 1fa0: 80200060 8058f958 00000000 00000000 00000004 40946400 20000300 00000000 1fc0: 00000000 00000000 003463b0 00000036 00346378 00000000 00000001 76f150dc 1fe0: 76f14e88 76f14e78 00018ba0 001302e0 60000010 00000004 00000000 00000000 Call trace: [<814314e0>] (parport_attach) from [<8142d1c8>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d6640 [<8142d0bc>] (comedi_device_attach) from [<814289d4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84fe8000 r9:00000004 r8:00000003 r7:40946400 r6:b5403587 r5:833a09c0 r4:20000300 [<81428900>] (do_devconfig_ioctl) from [<81429cf8>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000300 r5:833a09c0 r4:838f29c0 [<814299a4>] (comedi_unlocked_ioctl) from [<8058fb90>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814299a4>] (comedi_unlocked_ioctl) from [<8058fb90>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814299a4>] (comedi_unlocked_ioctl) from [<8058fb90>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814299a4>] (comedi_unlocked_ioctl) from [<8058fb90>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84fe8000 r9:00000004 r8:838f29c0 r7:20000300 r6:40946400 r5:838f29c1 r4:00000000 [<8058f94c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea871fa8 to 0xea871ff0) 1fa0: 00000000 00000000 00000004 40946400 20000300 00000000 1fc0: 00000000 00000000 003463b0 00000036 00346378 00000000 00000001 76f150dc 1fe0: 76f14e88 76f14e78 00018ba0 001302e0 r10:00000036 r9:84fe8000 r8:8020029c r7:00000036 r6:003463b0 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