8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10636 Comm: syz.7.1208 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<8143e3b0>] lr : [<8143e39c>] psr: 60000013 sp : e0179cb8 ip : e0179cb8 fp : e0179cd4 r10: 00000000 r9 : 00000084 r8 : e0179da4 r7 : 00004f27 r6 : 0000009b r5 : 84757480 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84757480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859caa00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84757480 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84757480 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xe0178000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe0178000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe0178000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.7.1208 (pid: 10636, stack limit = 0xe0178000) Stack: (0xe0179cb8 to 0xe017a000) 9ca0: 8143e350 00004f27 9cc0: 84757480 00004f27 e0179cf4 e0179cd8 8143e08c 8143e35c 00004f27 80522770 9ce0: 861cf800 861cf800 e0179d14 e0179cf8 8143e444 8143e040 84757480 00000000 9d00: 861cf800 00004f27 e0179d54 e0179d18 8143e5f4 8143e3c8 82b04a74 830e6300 9d20: 828217c0 00000000 00000000 829d6e04 84757480 00000000 e0179d90 84757480 9d40: 00000000 82b2efdc e0179d8c e0179d58 8142cf2c 8143e58c 40946400 00000000 9d60: e0179d7c 200000c0 84757480 b5403587 40946400 00000003 00000003 84616000 9d80: e0179e4c e0179d90 81428740 8142ce2c 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 9dc0: 5c952399 80000005 000003ff 00000802 00001600 00000001 00000000 00000009 9de0: 00000005 00000009 00000081 00000003 00000395 80000089 fffffffd 00000002 9e00: fffffff5 ffffeadc 00000003 0000003c 0000fffe 00000004 00000000 dffffffa 9e20: 00000000 1ca00595 00000000 85ec4600 84757480 200000c0 40946400 00000003 9e40: e0179f14 e0179e50 81429a64 81428678 00000000 1ca00595 00000000 00000000 9e60: 824b857c e0179ea4 0000005f 8421a448 00000064 847574b0 e0179ee4 e0179e88 9e80: 807cd9ac 807c3d84 00000064 00000001 00000000 e0179ea4 86512250 83426f68 9ea0: 00006400 0000000b e0179e98 00000000 00000000 1ca00595 00000000 85ec4600 9ec0: 40946400 200000c0 200000c0 85ec4600 00000003 84616000 e0179ef4 e0179ee8 9ee0: 807cdadc 1ca00595 e0179f14 00000000 85ec4601 40946400 200000c0 85ec4600 9f00: 00000003 84616000 e0179fa4 e0179f18 8058f8c4 8142971c ecac8b10 84616000 9f20: e0179f3c e0179f30 81ae1874 81ae1740 e0179f54 e0179f40 8025a85c 8028c340 9f40: e0179fb0 40000000 e0179f84 e0179f58 80220bf8 8025a818 00000000 8281d2bc 9f60: e0179fb0 0013e290 ecac8b10 80220b4c 00000000 1ca00595 e0179fac 00000000 9f80: 00000000 00346310 00000036 8020029c 84616000 00000036 00000000 e0179fa8 9fa0: 80200060 8058f68c 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f760dc 9fe0: 76f75e88 76f75e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e350>] (subdev_8255_io) from [<8143e08c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:84757480 r5:00004f27 r4:8143e350 [<8143e034>] (subdev_8255_do_config) from [<8143e444>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e034>] (subdev_8255_do_config) from [<8143e444>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:861cf800 [<8143e3bc>] (subdev_8255_io_init) from [<8143e5f4>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e3bc>] (subdev_8255_io_init) from [<8143e5f4>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:861cf800 r5:00000000 r4:84757480 [<8143e580>] (dev_8255_attach) from [<8142cf2c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:84757480 r7:e0179d90 r6:00000000 r5:84757480 r4:829d6e04 [<8142ce20>] (comedi_device_attach) from [<81428740>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84616000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84757480 r4:200000c0 [<8142866c>] (do_devconfig_ioctl) from [<81429a64>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:84757480 r4:85ec4600 [<81429710>] (comedi_unlocked_ioctl) from [<8058f8c4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429710>] (comedi_unlocked_ioctl) from [<8058f8c4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429710>] (comedi_unlocked_ioctl) from [<8058f8c4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429710>] (comedi_unlocked_ioctl) from [<8058f8c4>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84616000 r9:00000003 r8:85ec4600 r7:200000c0 r6:40946400 r5:85ec4601 r4:00000000 [<8058f680>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0179fa8 to 0xe0179ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f760dc 9fe0: 76f75e88 76f75e78 00018ba0 001300f0 r10:00000036 r9:84616000 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction