8<--- cut here --- Unable to handle kernel paging request at virtual address 5bd3b000 [5bd3b000] *pgd=80000080005003, *pmd=00000000 Internal error: Oops: 206 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3880 Comm: kworker/1:3 Not tainted 6.1.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: events free_ipc PC is at percpu_counter_add_batch+0x38/0x108 lib/percpu_counter.c:87 LR is at __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:66 pc : [<80810174>] lr : [<81756424>] psr: 20000113 sp : dfae1e28 ip : dfae1e18 fp : dfae1e4c r10: 83d51608 r9 : 7fffffff r8 : 850047ec r7 : 7fffffff r6 : ffffffff r5 : 83d51608 r4 : ffffffff r3 : 5bd3b000 r2 : ffffffff r1 : 00000000 r0 : 00000001 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 851f11c0 DAC: 00000000 Register r0 information: non-paged memory Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-cg-1k start 83d51400 pointer offset 520 size 1024 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: slab kmalloc-cg-192 start 85004780 pointer offset 108 size 192 Register r9 information: non-paged memory Register r10 information: slab kmalloc-cg-1k start 83d51400 pointer offset 520 size 1024 Register r11 information: 2-page vmalloc region starting at 0xdfae0000 allocated at kernel_clone+0x9c/0x3f4 kernel/fork.c:2671 Register r12 information: 2-page vmalloc region starting at 0xdfae0000 allocated at kernel_clone+0x9c/0x3f4 kernel/fork.c:2671 Process kworker/1:3 (pid: 3880, stack limit = 0xdfae0000) Stack: (0xdfae1e28 to 0xdfae2000) 1e20: 851a4600 850047ec 85004780 83d51400 850047ec 7fffffff 1e40: dfae1e94 dfae1e50 80663798 80810148 7fffffff 802a0f18 00000400 00000001 1e60: dfae1e5c ce12e263 83d514b8 00000001 83d514b8 00000400 83d51400 806636c8 1e80: 00000001 85004780 dfae1ecc dfae1e98 8066ec68 806636d4 dfae1ebc 83d514a0 1ea0: 808100c8 83d51400 00000000 ddde5a40 ddde9200 00000090 858edc00 ddde9215 1ec0: dfae1ee4 dfae1ed0 80664ca8 8066ec00 83d51400 00000000 dfae1efc dfae1ee8 1ee0: 8066e794 80664c80 8232cd6c 85b8ac80 dfae1f44 dfae1f00 802611c0 8066e71c 1f00: 80275518 802a0f18 dfae1f2c dfae1f18 80262ea4 00000000 ddde5a40 85b8ac80 1f20: ddde5a40 85b8ac98 ddde5a5c 82204d40 00000008 ddde5a40 dfae1f84 dfae1f48 1f40: 802615cc 80260fc0 dfae1f64 81cffd6c 823d7b0e 858edc00 dfae1f84 85ba2f00 1f60: 858edc00 80261560 85b8ac80 8501ecc0 edb31e8c 00000000 dfae1fac dfae1f88 1f80: 80269b24 8026156c 85ba2f00 80269a38 00000000 00000000 00000000 00000000 1fa0: 00000000 dfae1fb0 80200100 80269a44 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 Backtrace: [<8081013c>] (percpu_counter_add_batch) from [<80663798>] (percpu_counter_add_local include/linux/percpu_counter.h:75 [inline]) [<8081013c>] (percpu_counter_add_batch) from [<80663798>] (percpu_counter_sub_local include/linux/percpu_counter.h:225 [inline]) [<8081013c>] (percpu_counter_add_batch) from [<80663798>] (freeque+0xd0/0x16c ipc/msg.c:289) r9:7fffffff r8:850047ec r7:83d51400 r6:85004780 r5:850047ec r4:851a4600 [<806636c8>] (freeque) from [<8066ec68>] (free_ipcs+0x74/0x90 ipc/namespace.c:125) r10:85004780 r9:00000001 r8:806636c8 r7:83d51400 r6:00000400 r5:83d514b8 r4:00000001 [<8066ebf4>] (free_ipcs) from [<80664ca8>] (msg_exit_ns+0x34/0x48 ipc/msg.c:1334) r10:ddde9215 r9:858edc00 r8:00000090 r7:ddde9200 r6:ddde5a40 r5:00000000 r4:83d51400 [<80664c74>] (msg_exit_ns) from [<8066e794>] (free_ipc_ns ipc/namespace.c:138 [inline]) [<80664c74>] (msg_exit_ns) from [<8066e794>] (free_ipc+0x84/0xfc ipc/namespace.c:157) r5:00000000 r4:83d51400 [<8066e710>] (free_ipc) from [<802611c0>] (process_one_work+0x20c/0x5ac kernel/workqueue.c:2289) r5:85b8ac80 r4:8232cd6c [<80260fb4>] (process_one_work) from [<802615cc>] (worker_thread+0x6c/0x4e0 kernel/workqueue.c:2436) r10:ddde5a40 r9:00000008 r8:82204d40 r7:ddde5a5c r6:85b8ac98 r5:ddde5a40 r4:85b8ac80 [<80261560>] (worker_thread) from [<80269b24>] (kthread+0xec/0x11c kernel/kthread.c:376) r10:00000000 r9:edb31e8c r8:8501ecc0 r7:85b8ac80 r6:80261560 r5:858edc00 r4:85ba2f00 [<80269a38>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:148) Exception stack(0xdfae1fb0 to 0xdfae1ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80269a38 r4:85ba2f00 Code: e34801ec eb3d18a6 e5951018 ee1d3f90 (e7918003) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e34801ec movt r0, #33260 ; 0x81ec 4: eb3d18a6 bl 0xf462a4 8: e5951018 ldr r1, [r5, #24] c: ee1d3f90 mrc 15, 0, r3, cr13, cr0, {4} * 10: e7918003 ldr r8, [r1, r3] <-- trapping instruction