8<--- cut here --- Unable to handle kernel paging request at virtual address fee04fa6 when write [fee04fa6] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 32137 Comm: syz.5.5248 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 : [<814343b4>] lr : [<814343a4>] psr: 60000013 sp : dfa75d30 ip : dfa75d30 fp : dfa75d54 r10: 82b2f06c r9 : 00000003 r8 : 846f46c0 r7 : dfa75d90 r6 : 846f46c0 r5 : 00000000 r4 : 00000000 r3 : fee04fa6 r2 : 81e24af8 r1 : 00000001 r0 : 81434024 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84dd95c0 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 846f46c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa74000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 846f46c0 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 0xdfa74000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfa74000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.5.5248 (pid: 32137, stack limit = 0xdfa74000) Stack: (0xdfa75d30 to 0xdfa76000) 5d20: 82444c4c 846f46c0 829d675c 829d675c 5d40: 81e24fb8 00000000 dfa75d8c dfa75d58 8142ff2c 8143424c 40946400 00000000 5d60: dfa75d7c 200000c0 846f46c0 b5403587 40946400 00000003 00000003 847855c0 5d80: dfa75e4c dfa75d90 8142b738 8142fe2c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004fa6 00000105 00000004 10000421 02000001 00400cc5 7ffffffe 5dc0: 5c952398 00000005 000003ff 00000002 00000300 fffffffe 00000001 00000009 5de0: 00000000 00040400 00000009 00000002 000001ff 80000089 0000000a 01400000 5e00: 20001e54 0000000d 00000003 00000001 00000005 00000004 07ffffff 00004857 5e20: 00000000 a8eddd80 00000000 864cc6c0 846f46c0 200000c0 40946400 00000003 5e40: dfa75f14 dfa75e50 8142ca5c 8142b670 00000000 a8eddd80 00000000 00000000 5e60: 824b957c dfa75ea4 0000005f 845e2058 00000064 846f46f0 dfa75ee4 dfa75e88 5e80: 807cf740 807c5b18 00000064 00000001 00000000 dfa75ea4 863f3610 834326e8 5ea0: 00006400 0000000b dfa75e98 00000000 00000000 a8eddd80 00000000 864cc6c0 5ec0: 40946400 200000c0 200000c0 864cc6c0 00000003 847855c0 dfa75ef4 dfa75ee8 5ee0: 807cf870 a8eddd80 dfa75f14 00000000 864cc6c1 40946400 200000c0 864cc6c0 5f00: 00000003 847855c0 dfa75fa4 dfa75f18 80590bdc 8142c714 ecac8b10 847855c0 5f20: dfa75f3c dfa75f30 81ae5414 81ae52e0 dfa75f54 dfa75f40 8025a87c 8028c380 5f40: dfa75fb0 40000000 dfa75f84 dfa75f58 80220bf8 8025a838 00000000 8281d2fc 5f60: dfa75fb0 0013e480 ecac8b10 80220b4c 00000000 a8eddd80 dfa75fac 00000000 5f80: 00000000 00346310 00000036 8020029c 847855c0 00000036 00000000 dfa75fa8 5fa0: 80200060 805909a4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f330dc 5fe0: 76f32e88 76f32e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81434240>] (parport_attach) from [<8142ff2c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24fb8 r4:829d675c [<8142fe20>] (comedi_device_attach) from [<8142b738>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:847855c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846f46c0 r4:200000c0 [<8142b664>] (do_devconfig_ioctl) from [<8142ca5c>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:846f46c0 r4:864cc6c0 [<8142c708>] (comedi_unlocked_ioctl) from [<80590bdc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c708>] (comedi_unlocked_ioctl) from [<80590bdc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c708>] (comedi_unlocked_ioctl) from [<80590bdc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c708>] (comedi_unlocked_ioctl) from [<80590bdc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:847855c0 r9:00000003 r8:864cc6c0 r7:200000c0 r6:40946400 r5:864cc6c1 r4:00000000 [<80590998>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa75fa8 to 0xdfa75ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f330dc 5fe0: 76f32e88 76f32e78 00018ba0 001302e0 r10:00000036 r9:847855c0 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