8<--- cut here --- Unable to handle kernel paging request at virtual address fee00297 when write [fee00297] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7320 Comm: syz.0.784 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 : [<81466a50>] lr : [<81466a3c>] psr: 60000013 sp : eb181cb8 ip : eb181cb8 fp : eb181cd4 r10: 00000294 r9 : 00000004 r8 : eb181da4 r7 : 00000000 r6 : 0000009b r5 : 8334d000 r4 : 00000297 r3 : 0000009b r2 : fee00297 r1 : 00000001 r0 : 8334d000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863a7dc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8334d000 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 8334d000 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 0xeb180000 allocated at kernel_clone+0xbc/0x43c 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 0xeb180000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xeb180000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.0.784 (pid: 7320, stack limit = 0xeb180000) Stack: (0xeb181cb8 to 0xeb182000) 1ca0: 814669f0 00000294 1cc0: 8334d000 00000000 eb181cf4 eb181cd8 8146672c 814669fc 00000294 80532538 1ce0: 861de800 861de800 eb181d14 eb181cf8 81466ae4 814666e0 8334d000 00000000 1d00: 861de800 00000000 eb181d54 eb181d18 81466c94 81466a68 ffffffff 00000004 1d20: 82a20900 00000000 00000000 82bd3438 8334d000 00000000 eb181d90 8334d000 1d40: 00000000 82d2cdc4 eb181d8c eb181d58 81455620 81466c2c 40946400 00000000 1d60: eb181d7c 20000140 8334d000 b5403587 40946400 00000000 00000003 83997080 1d80: eb181e4c eb181d90 81450e2c 81455524 35353238 00000000 00000000 00000000 1da0: 00000000 00000294 00000002 7fffffff 00000008 0000002f 00002006 000000f1 1dc0: 00000008 00080ffa 00000002 00000000 00008500 00001003 00000008 0000000f 1de0: 00010000 00000063 7ffffffd 000001ff 200009ea 20000010 00040000 00000008 1e00: 00000008 00007470 00000004 00000005 00000008 7a2e6ff0 00000004 00007ffd 1e20: 00000000 b4ca2d0a 00000000 838d9380 8334d000 20000140 40946400 00000000 1e40: eb181f14 eb181e50 81452150 81450d64 00000000 b4ca2d0a 00000000 00000000 1e60: 82531804 eb181ea4 0000005f 842874a0 00000064 8334d030 eb181ee4 eb181e88 1e80: 807ea1fc 807e0510 00000064 00000001 00000000 eb181ea4 830eae50 834f0cc0 1ea0: 00006400 0000000b eb181e98 00000000 00000000 b4ca2d0a 00000000 838d9380 1ec0: 40946400 20000140 20000140 838d9380 00000003 83997080 eb181ef4 eb181ee8 1ee0: 807ea330 b4ca2d0a eb181f14 00000000 838d9381 40946400 20000140 838d9380 1f00: 00000003 83997080 eb181fa4 eb181f18 805a1b84 81451e08 ecac8b10 83997080 1f20: eb181f3c eb181f30 81b17c14 81b17ae0 eb181f54 eb181f40 8025a6bc 8028e2a4 1f40: eb181fb0 40000000 eb181f84 eb181f58 80220be0 8025a678 00000000 82a1c63c 1f60: eb181fb0 0013e9b0 ecac8b10 80220b34 00000000 b4ca2d0a eb181fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83997080 00000036 00000000 eb181fa8 1fa0: 80200060 805a194c 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc 1fe0: 76fc8e88 76fc8e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<814669f0>] (subdev_8255_io) from [<8146672c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8334d000 r5:00000294 r4:814669f0 [<814666d4>] (subdev_8255_do_config) from [<81466ae4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814666d4>] (subdev_8255_do_config) from [<81466ae4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:861de800 [<81466a5c>] (subdev_8255_io_init) from [<81466c94>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81466a5c>] (subdev_8255_io_init) from [<81466c94>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:861de800 r5:00000000 r4:8334d000 [<81466c20>] (dev_8255_attach) from [<81455620>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8334d000 r7:eb181d90 r6:00000000 r5:8334d000 r4:82bd3438 [<81455518>] (comedi_device_attach) from [<81450e2c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83997080 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:8334d000 r4:20000140 [<81450d58>] (do_devconfig_ioctl) from [<81452150>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000000 r7:40946400 r6:20000140 r5:8334d000 r4:838d9380 [<81451dfc>] (comedi_unlocked_ioctl) from [<805a1b84>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81451dfc>] (comedi_unlocked_ioctl) from [<805a1b84>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81451dfc>] (comedi_unlocked_ioctl) from [<805a1b84>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81451dfc>] (comedi_unlocked_ioctl) from [<805a1b84>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83997080 r9:00000003 r8:838d9380 r7:20000140 r6:40946400 r5:838d9381 r4:00000000 [<805a1940>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeb181fa8 to 0xeb181ff0) 1fa0: 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc 1fe0: 76fc8e88 76fc8e78 00018ebc 00130810 r10:00000036 r9:83997080 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