genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00060 when write [fee00060] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 17492 Comm: syz.0.4239 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 : [<814315f4>] lr : [<814315e4>] psr: 60000013 sp : dfb31d30 ip : dfb31d30 fp : dfb31d54 r10: 82b2efdc r9 : 00000003 r8 : 8339e900 r7 : dfb31d90 r6 : 8339e900 r5 : 00000000 r4 : 00000000 r3 : fee00060 r2 : 81e24958 r1 : 00000001 r0 : 81431264 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86ba03c0 DAC: fffffffd 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 8339e900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb30000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8339e900 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 0xdfb30000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfb30000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.0.4239 (pid: 17492, stack limit = 0xdfb30000) Stack: (0xdfb31d30 to 0xdfb32000) 1d20: 82443f9c 8339e900 dfb31d58 829d6640 1d40: 81e24e18 00000000 dfb31d8c dfb31d58 8142d16c 8143148c 40946400 00000000 1d60: dfb31d7c 20000300 8339e900 b5403587 40946400 00000003 00000003 83e2b000 1d80: dfb31e4c dfb31d90 81428980 8142d06c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000060 0000001f 00010000 00000004 00000003 00000cc7 00000004 1dc0: fffffff0 0000000e 00000006 00000002 00000002 00000007 00000001 00000006 1de0: 10000105 00000000 0001244d 00000003 3fff7fff 00000089 00000010 00000001 1e00: 20001e58 0080000d 00000e6c 00000008 00000008 00000006 ffffffff effffff8 1e20: 00000000 6039b2fd 00000000 85c3a600 8339e900 20000300 40946400 00000003 1e40: dfb31f14 dfb31e50 81429ca4 814288b8 00000000 6039b2fd 00000000 00000000 1e60: 824b857c dfb31ea4 0000005f 841959f0 00000064 8339e930 dfb31ee4 dfb31e88 1e80: 807cdb3c 807c3f14 00000064 00000001 00000000 dfb31ea4 830cd6d0 834ebbb0 1ea0: 00006400 0000000b dfb31e98 00000000 00000000 6039b2fd 00000000 85c3a600 1ec0: 40946400 20000300 20000300 85c3a600 00000003 83e2b000 dfb31ef4 dfb31ee8 1ee0: 807cdc6c 6039b2fd dfb31f14 00000000 85c3a601 40946400 20000300 85c3a600 1f00: 00000003 83e2b000 dfb31fa4 dfb31f18 8058fa5c 8142995c ecac8b10 83e2b000 1f20: dfb31f3c dfb31f30 81ae18b4 81ae1780 dfb31f54 dfb31f40 8025a85c 8028c340 1f40: dfb31fb0 40000000 dfb31f84 dfb31f58 80220bf8 8025a818 00000000 8281d2bc 1f60: dfb31fb0 0013e290 ecac8b10 80220b4c 00000000 6039b2fd dfb31fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83e2b000 00000036 00000000 dfb31fa8 1fa0: 80200060 8058f824 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9e0dc 1fe0: 76f9de88 76f9de78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<81431480>] (parport_attach) from [<8142d16c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24e18 r4:829d6640 [<8142d060>] (comedi_device_attach) from [<81428980>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83e2b000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8339e900 r4:20000300 [<814288ac>] (do_devconfig_ioctl) from [<81429ca4>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000300 r5:8339e900 r4:85c3a600 [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e2b000 r9:00000003 r8:85c3a600 r7:20000300 r6:40946400 r5:85c3a601 r4:00000000 [<8058f818>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb31fa8 to 0xdfb31ff0) 1fa0: 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9e0dc 1fe0: 76f9de88 76f9de78 00018ba0 001300f0 r10:00000036 r9:83e2b000 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