8<--- cut here --- Unable to handle kernel paging request at virtual address fee04e2a when write [fee04e2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 31097 Comm: syz.5.6820 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 : [<8140e268>] lr : [<8140e254>] psr: 60000013 sp : dfc81cb8 ip : dfc81cb8 fp : dfc81cd4 r10: 00000000 r9 : 00000084 r8 : dfc81da4 r7 : 00004e27 r6 : 0000009b r5 : 844dbc00 r4 : 00004e2a r3 : 0000009b r2 : fee04e2a r1 : 00000001 r0 : 844dbc00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 851ae440 DAC: 00000000 Register r0 information: slab kmalloc-192 start 844dbc00 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 844dbc00 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 0xdfc80000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfc80000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfc80000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.5.6820 (pid: 31097, stack limit = 0xdfc80000) Stack: (0xdfc81cb8 to 0xdfc82000) 1ca0: 8140e208 00004e27 1cc0: 844dbc00 00004e27 dfc81cf4 dfc81cd8 8140df44 8140e214 00004e27 805161bc 1ce0: 853b0c00 853b0c00 dfc81d14 dfc81cf8 8140e2fc 8140def8 844dbc00 00000000 1d00: 853b0c00 00004e27 dfc81d54 dfc81d18 8140e4ac 8140e280 82af6b34 85e9ba00 1d20: 828215b0 00000000 00000000 829d4a44 844dbc00 00000000 dfc81d90 844dbc00 1d40: 00000000 82b29b30 dfc81d8c dfc81d58 813fcea0 8140e444 40946400 00000000 1d60: dfc81d7c 20000440 844dbc00 b5403587 40946400 83308c00 00000003 844dbc30 1d80: dfc81e4c dfc81d90 813f87d8 813fcda0 35353238 00000000 00000000 00000000 1da0: 00000000 00004e27 00000005 00000003 00000b55 000000e7 80000008 00000000 1dc0: 00000a82 0000ff46 00000100 00000cf3 00000009 000001d8 00000002 00000006 1de0: 00000101 00000001 0001008b 00000003 00000000 00000004 80000001 00000008 1e00: 02000007 0000000b 00000005 0000003c 00000005 7fffffff 0000ffff fffffff8 1e20: 00000000 b7ecc6cd 00000000 851a9c00 844dbc00 20000440 40946400 83308c00 1e40: dfc81f14 dfc81e50 813f9358 813f8710 00000000 b7ecc6cd 00000000 00000000 1e60: 824b15ec dfc81ea4 0000005f 8404b018 00000064 845accfc dfc81ee4 dfc81e88 1e80: 807b3fb4 807aa630 00000064 00000001 00000000 dfc81ea4 86f330d0 834e1990 1ea0: 00006400 0000000b dfc81e98 00000000 00000000 b7ecc6cd dfc81f24 851a9c00 1ec0: 40946400 20000440 20000440 851a9c00 00000003 83308c00 dfc81ef4 dfc81ee8 1ee0: 807b40e4 b7ecc6cd dfc81f14 00000000 851a9c01 40946400 20000440 851a9c00 1f00: 00000003 83308c00 dfc81fa4 dfc81f18 805821a4 813f9260 ecac8b10 83308c00 1f20: dfc81f3c dfc81f30 81aa6d38 81aa6c08 dfc81f54 dfc81f40 8025ba7c 8028ef68 1f40: dfc81fb0 40000000 dfc81f84 dfc81f58 80221a54 8025ba38 00000000 8281cf7c 1f60: dfc81fb0 0013ddc0 ecac8b10 802219a8 00000000 b7ecc6cd dfc81fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83308c00 00000036 00000000 dfc81fa8 1fa0: 80200060 80581f6c 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3f0dc 1fe0: 76f3ee88 76f3ee78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<8140e208>] (subdev_8255_io) from [<8140df44>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004e27 r6:844dbc00 r5:00004e27 r4:8140e208 [<8140deec>] (subdev_8255_do_config) from [<8140e2fc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8140deec>] (subdev_8255_do_config) from [<8140e2fc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:853b0c00 [<8140e274>] (subdev_8255_io_init) from [<8140e4ac>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8140e274>] (subdev_8255_io_init) from [<8140e4ac>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004e27 r6:853b0c00 r5:00000000 r4:844dbc00 [<8140e438>] (dev_8255_attach) from [<813fcea0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b29b30 r9:00000000 r8:844dbc00 r7:dfc81d90 r6:00000000 r5:844dbc00 r4:829d4a44 [<813fcd94>] (comedi_device_attach) from [<813f87d8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:844dbc30 r9:00000003 r8:83308c00 r7:40946400 r6:b5403587 r5:844dbc00 r4:20000440 [<813f8704>] (do_devconfig_ioctl) from [<813f9358>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:83308c00 r7:40946400 r6:20000440 r5:844dbc00 r4:851a9c00 [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:83308c00 r9:00000003 r8:851a9c00 r7:20000440 r6:40946400 r5:851a9c01 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc81fa8 to 0xdfc81ff0) 1fa0: 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3f0dc 1fe0: 76f3ee88 76f3ee78 00018734 0012fc20 r10:00000036 r9:83308c00 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