8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2c when write [fee04f2c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 25951 Comm: syz.0.5054 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 : [<81417444>] lr : [<81417430>] psr: 60000013 sp : ea461cb0 ip : ea461cb0 fp : ea461ccc r10: 00000001 r9 : 00000084 r8 : ea461d9c r7 : 00004f29 r6 : 0000009b r5 : 84514600 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 84514600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84ded340 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84514600 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 84514600 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 0xea460000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea460000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea460000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.5054 (pid: 25951, stack limit = 0xea460000) Stack: (0xea461cb0 to 0xea462000) 1ca0: 814173e4 84514600 00004f29 00004f29 1cc0: ea461cec ea461cd0 8141711c 814173f0 00004f29 80515514 852a4800 852a4800 1ce0: ea461d0c ea461cf0 814174dc 814170d0 84514600 00000000 852a4800 00004f29 1d00: ea461d4c ea461d10 81417688 8141745c 0000005f 83345f80 828215b0 00000000 1d20: 00000000 829d46a0 84514600 84514644 ea461d88 84514600 00000000 82b28ad8 1d40: ea461d84 ea461d50 814061bc 81417620 84514630 00000000 ea461d74 20000680 1d60: 84514600 b5403587 84514630 844f8000 40946400 00000003 ea461e44 ea461d88 1d80: 81401b14 814060c0 35353238 00000000 00000000 00000000 00000000 00004f29 1da0: 00000005 00000003 00000009 00000001 00000000 00000012 00000002 00000081 1dc0: fffffffc 00000002 fffffffe 00000009 00001887 00000061 00000002 00000008 1de0: 00400009 00000009 00000005 00000099 000000c0 00000400 ffffffff 00008001 1e00: 02000e69 00000006 00080008 00000004 00000000 ffff0000 00000000 c2db2b11 1e20: 00000000 84c94180 84514600 20000680 84514630 844f8000 ea461f14 ea461e48 1e40: 81402b08 81401a20 00000000 00000000 00000000 00000000 00000000 c2db2b11 1e60: 00000000 00000000 824a45ec 0000005f 84138e20 00000064 84547cb4 844f8000 1e80: ea461ee4 ea461e90 807b8730 807aec54 00000064 00000001 00000000 ea461eac 1ea0: 85c05250 83425b28 00006400 0000000b ea461ea0 00000000 ea461d40 c2db2b11 1ec0: 84c94180 40946400 20000680 20000680 84c94180 00000003 ea461ef4 ea461ee8 1ee0: 807b8850 c2db2b11 ea461f14 40946400 00000000 84c94181 20000680 84c94180 1f00: 00000003 844f8000 ea461fa4 ea461f18 80585cc0 81402558 ecac8b10 844f8000 1f20: ea461f3c ea461f30 81ab1624 81ab14f4 ea461f54 ea461f40 8025bcbc 8028e0c4 1f40: ea461fb0 40000000 ea461f84 ea461f58 80221a38 8025bc78 00000000 8281cf7c 1f60: ea461fb0 0014c8c0 ecac8b10 8022198c 00000000 c2db2b11 ea461fac 00000000 1f80: 00000000 00326310 00000036 8020029c 844f8000 00000036 00000000 ea461fa8 1fa0: 80200060 80585b9c 00000000 00000000 00000003 40946400 20000680 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f8f0bc 1fe0: 76f8eec0 76f8eeb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<814173e4>] (subdev_8255_io) from [<8141711c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:84514600 r4:814173e4 [<814170c4>] (subdev_8255_do_config) from [<814174dc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814170c4>] (subdev_8255_do_config) from [<814174dc>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:852a4800 [<81417450>] (subdev_8255_io_init) from [<81417688>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81417450>] (subdev_8255_io_init) from [<81417688>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f29 r6:852a4800 r5:00000000 r4:84514600 [<81417614>] (dev_8255_attach) from [<814061bc>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:84514600 r7:ea461d88 r6:84514644 r5:84514600 r4:829d46a0 [<814060b4>] (comedi_device_attach) from [<81401b14>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:844f8000 r7:84514630 r6:b5403587 r5:84514600 r4:20000680 [<81401a14>] (do_devconfig_ioctl) from [<81402b08>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:844f8000 r7:84514630 r6:20000680 r5:84514600 r4:84c94180 [<8140254c>] (comedi_unlocked_ioctl) from [<80585cc0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8140254c>] (comedi_unlocked_ioctl) from [<80585cc0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8140254c>] (comedi_unlocked_ioctl) from [<80585cc0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8140254c>] (comedi_unlocked_ioctl) from [<80585cc0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:844f8000 r9:00000003 r8:84c94180 r7:20000680 r6:84c94181 r5:00000000 r4:40946400 [<80585b90>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea461fa8 to 0xea461ff0) 1fa0: 00000000 00000000 00000003 40946400 20000680 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f8f0bc 1fe0: 76f8eec0 76f8eeb0 000192bc 00132360 r10:00000036 r9:844f8000 r8:8020029c r7:00000036 r6:00326310 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