8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=849b1003, *pmd=df115003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3104 Comm: syz-executor103 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<8088956c>] lr : [<80889cb0>] psr: 20000013 sp : df971dc0 ip : df971e08 fp : df971e04 r10: 00000242 r9 : 00000000 r8 : 8499d580 r7 : 8498780c r6 : 84987800 r5 : df971e44 r4 : 84990000 r3 : 00000001 r2 : 8498780c r1 : df971e44 r0 : 84990000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8499d100 DAC: 00000000 Register r0 information: slab io_kiocb start 84990000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 84987800 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84990000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 84987800 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 84987800 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8499d580 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz-executor103 (pid: 3104, stack limit = 0xdf970000) Stack: (0xdf971dc0 to 0xdf972000) 1dc0: 81a4be54 8030cb0c 8494e900 00000001 00010000 8498780c 00000000 84990000 1de0: df971e44 84987800 8498780c 00000000 80000001 00000242 df971e1c df971e08 1e00: 80889cb0 80889554 83752500 84990000 df971e84 df971e20 808931e0 80889c54 1e20: df971e4c df971e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 1e40: 00000000 8498780c 00000000 00000000 00010001 c805563e 80886a40 84990000 1e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 840ba400 df971ebc df971e88 1e80: 80886bd8 80892f38 849903c0 84990480 84990540 8494e800 8499006c 84990000 1ea0: 84920000 00000000 00000000 840ba400 df971f14 df971ec0 808877a8 80886b7c 1ec0: 8088e164 81a4bdf8 849f3db8 8499d108 00000800 00000800 81cf0b5c 00000800 1ee0: 8494e800 c805563e 847d56c0 00000000 8494e800 00003516 847d56c0 00000000 1f00: 840ba400 00000000 df971fa4 df971f18 80888250 808875a8 df971f74 8494e840 1f20: 00000000 00000000 df971fac 847d56c0 00000003 00020000 df971f5c df971f48 1f40: 80553b94 844cd800 76f96000 8281d1f0 00000a0f 76f96000 df971fb0 80234108 1f60: 00000000 0008a270 df971fac df971f78 8023478c c805563e 000000c0 00000000 1f80: 00000000 0008e068 000001aa 8020029c 840ba400 000001aa 00000000 df971fa8 1fa0: 80200060 80888124 00000000 00000000 00000004 00003516 00000000 00000000 1fc0: 00000000 00000000 0008e068 000001aa 76fb6000 00000000 0008a270 00000001 1fe0: 7eb14c70 7eb14c60 00010860 0002f8f0 40000010 00000004 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000242 r9:80000001 r8:00000000 r7:8498780c r6:84987800 r5:df971e44 r4:84990000 [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:84990000 r4:83752500 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:840ba400 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:84990000 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:840ba400 r9:00000000 r8:00000000 r7:84920000 r6:84990000 r5:8499006c r4:8494e800 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:840ba400 r8:00000000 r7:847d56c0 r6:00003516 r5:8494e800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf971fa8 to 0xdf971ff0) 1fa0: 00000000 00000000 00000004 00003516 00000000 00000000 1fc0: 00000000 00000000 0008e068 000001aa 76fb6000 00000000 0008a270 00000001 1fe0: 7eb14c70 7eb14c60 00010860 0002f8f0 r10:000001aa r9:840ba400 r8:8020029c r7:000001aa r6:0008e068 r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction