8<--- cut here --- Unable to handle kernel paging request at virtual address fee01003 when write [fee01003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 27958 Comm: syz.9.5436 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 : [<814658e8>] lr : [<814658d4>] psr: 60000013 sp : ea5b9cb8 ip : ea5b9cb8 fp : ea5b9cd4 r10: 00001000 r9 : 00000004 r8 : ea5b9da4 r7 : 00000000 r6 : 0000009b r5 : 8301fd80 r4 : 00001003 r3 : 0000009b r2 : fee01003 r1 : 00000001 r0 : 8301fd80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 871d0b40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301fd80 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 8301fd80 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 0xea5b8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea5b8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea5b8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.9.5436 (pid: 27958, stack limit = 0xea5b8000) Stack: (0xea5b9cb8 to 0xea5ba000) 9ca0: 81465888 00001000 9cc0: 8301fd80 00000000 ea5b9cf4 ea5b9cd8 814655c4 81465894 00001000 805320dc 9ce0: 85d1d800 85d1d800 ea5b9d14 ea5b9cf8 8146597c 81465578 8301fd80 00000000 9d00: 85d1d800 00000000 ea5b9d54 ea5b9d18 81465b2c 81465900 ffffffff 00000004 9d20: 82a208c0 00000000 00000000 82bd325c 8301fd80 00000000 ea5b9d90 8301fd80 9d40: 00000000 82d2cdc4 ea5b9d8c ea5b9d58 814544b4 81465ac4 40946400 00000000 9d60: ea5b9d7c 20000380 8301fd80 b5403587 40946400 00000001 00000007 8400d5c0 9d80: ea5b9e4c ea5b9d90 8144fcc0 814543b8 35353238 00000000 00000000 00000000 9da0: 00000000 00001000 00002080 00000a1a 00000004 00000006 0800afa3 00000000 9dc0: 00000002 00005855 00000002 0000000b 000007ff 00000001 00000005 00000006 9de0: 00000002 00000000 00000004 00000002 0000000a 00000008 0000caa2 00001003 9e00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 000006f5 9e20: 00000000 524d993d 00000000 86b02c80 8301fd80 20000380 40946400 00000001 9e40: ea5b9f14 ea5b9e50 81450fe4 8144fbf8 00000000 524d993d 00000000 00000000 9e60: 82530804 ea5b9ea4 0000005f 8431ef18 00000064 8301fdb0 ea5b9ee4 ea5b9e88 9e80: 807e9240 807df554 00000064 00000001 00000000 ea5b9ea4 830ea250 8341acc0 9ea0: 00006400 0000000b ea5b9e98 00000000 00000000 524d993d 00000000 86b02c80 9ec0: 40946400 20000380 20000380 86b02c80 00000007 8400d5c0 ea5b9ef4 ea5b9ee8 9ee0: 807e9374 524d993d ea5b9f14 00000000 86b02c81 40946400 20000380 86b02c80 9f00: 00000007 8400d5c0 ea5b9fa4 ea5b9f18 805a16e0 81450c9c ecac8b10 8400d5c0 9f20: ea5b9f3c ea5b9f30 81b160d4 81b15fa0 ea5b9f54 ea5b9f40 8025a664 8028e168 9f40: ea5b9fb0 40000000 ea5b9f84 ea5b9f58 80220be0 8025a620 00000000 82a1c5fc 9f60: ea5b9fb0 0013e940 ecac8b10 80220b34 00000000 524d993d ea5b9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 8400d5c0 00000036 00000000 ea5b9fa8 9fa0: 80200060 805a14a8 00000000 00000000 00000007 40946400 20000380 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc 9fe0: 76fa1e88 76fa1e78 00018e58 001307a0 60000010 00000007 00000000 00000000 Call trace: [<81465888>] (subdev_8255_io) from [<814655c4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301fd80 r5:00001000 r4:81465888 [<8146556c>] (subdev_8255_do_config) from [<8146597c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8146556c>] (subdev_8255_do_config) from [<8146597c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85d1d800 [<814658f4>] (subdev_8255_io_init) from [<81465b2c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814658f4>] (subdev_8255_io_init) from [<81465b2c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85d1d800 r5:00000000 r4:8301fd80 [<81465ab8>] (dev_8255_attach) from [<814544b4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8301fd80 r7:ea5b9d90 r6:00000000 r5:8301fd80 r4:82bd325c [<814543ac>] (comedi_device_attach) from [<8144fcc0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8400d5c0 r9:00000007 r8:00000001 r7:40946400 r6:b5403587 r5:8301fd80 r4:20000380 [<8144fbec>] (do_devconfig_ioctl) from [<81450fe4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000380 r5:8301fd80 r4:86b02c80 [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8400d5c0 r9:00000007 r8:86b02c80 r7:20000380 r6:40946400 r5:86b02c81 r4:00000000 [<805a149c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea5b9fa8 to 0xea5b9ff0) 9fa0: 00000000 00000000 00000007 40946400 20000380 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc 9fe0: 76fa1e88 76fa1e78 00018e58 001307a0 r10:00000036 r9:8400d5c0 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