8<--- cut here --- Unable to handle kernel paging request at virtual address fee0f003 when write [fee0f003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 11768 Comm: syz.4.1809 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:99 [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 : [<8149f1e8>] lr : [<8149f1d4>] psr: 60000013 sp : df9f1cb8 ip : df9f1cb8 fp : df9f1cd4 r10: 0000f000 r9 : 00000004 r8 : df9f1da4 r7 : 00000000 r6 : 0000009b r5 : 8301ff00 r4 : 0000f003 r3 : 0000009b r2 : fee0f003 r1 : 00000001 r0 : 8301ff00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 861d9d00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301ff00 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301ff00 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.4.1809 (pid: 11768, stack limit = 0xdf9f0000) Stack: (0xdf9f1cb8 to 0xdf9f2000) 1ca0: 8149f188 0000f000 1cc0: 8301ff00 00000000 df9f1cf4 df9f1cd8 8149eec4 8149f194 0000f000 80545ff4 1ce0: 86137000 86137000 df9f1d14 df9f1cf8 8149f27c 8149ee78 8301ff00 00000000 1d00: 86137000 00000000 df9f1d54 df9f1d18 8149f42c 8149f200 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd9600 8301ff00 00000000 df9f1d90 8301ff00 1d40: 00000000 82d30dfc df9f1d8c df9f1d58 8148ddcc 8149f3c4 40946400 00000000 1d60: df9f1d7c 20000440 8301ff00 b5403587 40946400 00000001 00000008 84fd8c40 1d80: df9f1e4c df9f1d90 814895d0 8148dcd0 35353238 00000000 00000000 00000000 1da0: 00000000 0000f000 c0000000 00000005 ffffffff 0000000e 00800005 00000007 1dc0: 00000004 00000008 000000fd 7fffffff 00000001 00000001 fffffffc 0010000b 1de0: 0000b2ce 00000005 0004007a 00000003 00000003 00000089 00000012 0000007f 1e00: 00000000 00000005 00000e66 00000001 02000008 00005f79 00000000 00000005 1e20: 00000000 656fafb3 00000000 83869600 8301ff00 20000440 40946400 00000001 1e40: df9f1f14 df9f1e50 8148a8f8 81489510 00000000 656fafb3 00000000 00000000 1e60: 8254980c df9f1ea4 0000005f 8431ed40 00000064 8301ff30 df9f1ee4 df9f1e88 1e80: 80805b6c 807fbe9c 00000064 00000001 00000000 df9f1ea4 830eab10 834e8e58 1ea0: 00006400 0000000b df9f1e98 00000000 00000000 656fafb3 00000000 83869600 1ec0: 40946400 20000440 20000440 83869600 00000008 84fd8c40 df9f1ef4 df9f1ee8 1ee0: 80805ca0 656fafb3 df9f1f14 00000000 83869601 40946400 20000440 83869600 1f00: 00000008 84fd8c40 df9f1fa4 df9f1f18 805bab08 8148a5b0 ecac8b10 84fd8c40 1f20: df9f1f3c df9f1f30 81b56440 81b5630c df9f1f54 df9f1f40 8025a7a4 8028e480 1f40: df9f1fb0 40000000 df9f1f84 df9f1f58 80220bdc 8025a760 00000000 82a1eb0c 1f60: df9f1fb0 0013e9c0 ecac8b10 80220b30 00000000 656fafb3 df9f1fac 00000000 1f80: 00000000 00356450 00000036 8020029c 84fd8c40 00000036 00000000 df9f1fa8 1fa0: 80200060 805ba8d0 00000000 00000000 00000008 40946400 20000440 00000000 1fc0: 00000000 00000000 00356450 00000036 00356418 00000000 00000001 76edf0dc 1fe0: 76edee88 76edee78 00018ebc 00130820 60000010 00000008 00000000 00000000 Call trace: [<8149f188>] (subdev_8255_io) from [<8149eec4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301ff00 r5:0000f000 r4:8149f188 [<8149ee6c>] (subdev_8255_do_config) from [<8149f27c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149ee6c>] (subdev_8255_do_config) from [<8149f27c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86137000 [<8149f1f4>] (subdev_8255_io_init) from [<8149f42c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149f1f4>] (subdev_8255_io_init) from [<8149f42c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86137000 r5:00000000 r4:8301ff00 [<8149f3b8>] (dev_8255_attach) from [<8148ddcc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8301ff00 r7:df9f1d90 r6:00000000 r5:8301ff00 r4:82bd9600 [<8148dcc4>] (comedi_device_attach) from [<814895d0>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84fd8c40 r9:00000008 r8:00000001 r7:40946400 r6:b5403587 r5:8301ff00 r4:20000440 [<81489504>] (do_devconfig_ioctl) from [<8148a8f8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000440 r5:8301ff00 r4:83869600 [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84fd8c40 r9:00000008 r8:83869600 r7:20000440 r6:40946400 r5:83869601 r4:00000000 [<805ba8c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f1fa8 to 0xdf9f1ff0) 1fa0: 00000000 00000000 00000008 40946400 20000440 00000000 1fc0: 00000000 00000000 00356450 00000036 00356418 00000000 00000001 76edf0dc 1fe0: 76edee88 76edee78 00018ebc 00130820 r10:00000036 r9:84fd8c40 r8:8020029c r7:00000036 r6:00356450 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