Hello, syzbot found the following issue on: HEAD commit: 18a3c5f7 Merge tag 'for_linus' of git://git.kernel.org/pub.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes console output: https://syzkaller.appspot.com/x/log.txt?x=1662c153d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8ac1fe5995f69d7 dashboard link: https://syzkaller.appspot.com/bug?extid=0fb24f56fa707081e4f2 userspace arch: riscv64 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0fb24f56fa707081e4f2@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8643 at kernel/events/core.c:2781 __perf_install_in_context+0x1c0/0x47c kernel/events/core.c:2781 Modules linked in: CPU: 1 PID: 8643 Comm: syz-executor.0 Not tainted 5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0 Hardware name: riscv-virtio,qemu (DT) epc : __perf_install_in_context+0x1c0/0x47c kernel/events/core.c:2781 ra : __perf_install_in_context+0x1c0/0x47c kernel/events/core.c:2781 epc : ffffffe00027d7ba ra : ffffffe00027d7ba sp : ffffffe00818faf0 gp : ffffffe0045883c0 tp : ffffffe006dbaf80 t0 : ffffffc4010812b2 t1 : 0000000000000001 t2 : 0000000000000000 s0 : ffffffe00818fb50 s1 : ffffffe01ca95000 a0 : ffffffe066d79118 a1 : 00000000000f0000 a2 : ffffffd010ada000 a3 : ffffffe00027d7ba a4 : ffffffd010ae31f0 a5 : 000000000000123e a6 : 0000000000f00000 a7 : ffffffe00027d6ba s2 : ffffffe066d78f70 s3 : ffffffe01ca950a8 s4 : ffffffe00aacfc00 s5 : ffffffe006dbaf80 s6 : ffffffe066d78f78 s7 : ffffffe00d98bc00 s8 : ffffffe006dbaf80 s9 : ffffffe00458c0d0 s10: 0000000000000000 s11: 0000000000000000 t3 : 2699545dc3e5be00 t4 : ffffffc401031f97 t5 : ffffffc401031f99 t6 : ffffffe00f58c1f4 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 Call Trace: [<ffffffe00027d7ba>] __perf_install_in_context+0x1c0/0x47c kernel/events/core.c:2781 [<ffffffe00026bcbc>] remote_function kernel/events/core.c:91 [inline] [<ffffffe00026bcbc>] remote_function+0xa8/0xc0 kernel/events/core.c:71 [<ffffffe0001452b2>] generic_exec_single+0x1a6/0x212 kernel/smp.c:293 [<ffffffe000145452>] smp_call_function_single+0x134/0x2ba kernel/smp.c:513 [<ffffffe00026af46>] task_function_call+0x90/0xee kernel/events/core.c:119 [<ffffffe00027c5da>] perf_install_in_context+0x174/0x2e6 kernel/events/core.c:2902 [<ffffffe000288d1c>] __do_sys_perf_event_open+0x10ea/0x199e kernel/events/core.c:12169 [<ffffffe00028fa72>] sys_perf_event_open+0x34/0x46 kernel/events/core.c:11775 [<ffffffe000005578>] ret_from_syscall+0x0/0x2 irq event stamp: 1944 hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_memcg_lruvec_state include/linux/memcontrol.h:979 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_objcg_state mm/slab.h:296 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] memcg_slab_post_alloc_hook+0x2ea/0x46a mm/slab.h:327 hardirqs last disabled at (1944): [<ffffffe0001452ae>] generic_exec_single+0x1a2/0x212 kernel/smp.c:292 softirqs last enabled at (1900): [<ffffffe0020f5fd2>] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (1900): [<ffffffe0020f5fd2>] release_sock+0xf6/0x122 net/core/sock.c:3085 softirqs last disabled at (1898): [<ffffffe0020f5f06>] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (1898): [<ffffffe0020f5f06>] release_sock+0x2a/0x122 net/core/sock.c:3072 ---[ end trace 757ee55d225523fe ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8643 at kernel/events/core.c:3210 ctx_sched_out+0x312/0x548 kernel/events/core.c:3210 Modules linked in: CPU: 1 PID: 8643 Comm: syz-executor.0 Tainted: G W 5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0 Hardware name: riscv-virtio,qemu (DT) epc : ctx_sched_out+0x312/0x548 kernel/events/core.c:3210 ra : ctx_sched_out+0x312/0x548 kernel/events/core.c:3210 epc : ffffffe00027ca5e ra : ffffffe00027ca5e sp : ffffffe00818fa90 gp : ffffffe0045883c0 tp : ffffffe006dbaf80 t0 : ffffffc4010812b2 t1 : 0000000000000001 t2 : 0000000000000000 s0 : ffffffe00818faf0 s1 : ffffffe00aacfc00 a0 : ffffffe066d79118 a1 : 00000000000f0000 a2 : ffffffd010ada000 a3 : ffffffe00027ca5e a4 : ffffffd010c9c740 a5 : 00000000000384e8 a6 : 0000000000f00000 a7 : ffffffe00027d6ba s2 : ffffffe066d78f70 s3 : 0000000000000004 s4 : 0000000000000000 s5 : 0000000000000000 s6 : ffffffe00aacfd40 s7 : 0000000000000000 s8 : ffffffe006dbaf80 s9 : ffffffe00458c0d0 s10: 0000000000000000 s11: 0000000000000000 t3 : 2699545dc3e5be00 t4 : ffffffc401031f97 t5 : ffffffc401031f99 t6 : ffffffe00f58c1f4 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 Call Trace: [<ffffffe00027ca5e>] ctx_sched_out+0x312/0x548 kernel/events/core.c:3210 [<ffffffe00027d7ee>] __perf_install_in_context+0x1f4/0x47c kernel/events/core.c:2799 [<ffffffe00026bcbc>] remote_function kernel/events/core.c:91 [inline] [<ffffffe00026bcbc>] remote_function+0xa8/0xc0 kernel/events/core.c:71 [<ffffffe0001452b2>] generic_exec_single+0x1a6/0x212 kernel/smp.c:293 [<ffffffe000145452>] smp_call_function_single+0x134/0x2ba kernel/smp.c:513 [<ffffffe00026af46>] task_function_call+0x90/0xee kernel/events/core.c:119 [<ffffffe00027c5da>] perf_install_in_context+0x174/0x2e6 kernel/events/core.c:2902 [<ffffffe000288d1c>] __do_sys_perf_event_open+0x10ea/0x199e kernel/events/core.c:12169 [<ffffffe00028fa72>] sys_perf_event_open+0x34/0x46 kernel/events/core.c:11775 [<ffffffe000005578>] ret_from_syscall+0x0/0x2 irq event stamp: 1944 hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_memcg_lruvec_state include/linux/memcontrol.h:979 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_objcg_state mm/slab.h:296 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] memcg_slab_post_alloc_hook+0x2ea/0x46a mm/slab.h:327 hardirqs last disabled at (1944): [<ffffffe0001452ae>] generic_exec_single+0x1a2/0x212 kernel/smp.c:292 softirqs last enabled at (1900): [<ffffffe0020f5fd2>] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (1900): [<ffffffe0020f5fd2>] release_sock+0xf6/0x122 net/core/sock.c:3085 softirqs last disabled at (1898): [<ffffffe0020f5f06>] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (1898): [<ffffffe0020f5f06>] release_sock+0x2a/0x122 net/core/sock.c:3072 ---[ end trace 757ee55d225523ff ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8643 at kernel/events/core.c:2668 task_ctx_sched_out+0x5c/0x60 kernel/events/core.c:2668 Modules linked in: CPU: 1 PID: 8643 Comm: syz-executor.0 Tainted: G W 5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0 Hardware name: riscv-virtio,qemu (DT) epc : task_ctx_sched_out+0x5c/0x60 kernel/events/core.c:2668 ra : task_ctx_sched_out+0x5c/0x60 kernel/events/core.c:2668 epc : ffffffe00027ccf0 ra : ffffffe00027ccf0 sp : ffffffe00818fa70 gp : ffffffe0045883c0 tp : ffffffe006dbaf80 t0 : ffffffc4010812b2 t1 : 0000000000000001 t2 : 0000000000000000 s0 : ffffffe00818faa0 s1 : ffffffe066d78f70 a0 : ffffffe066d79118 a1 : 00000000000f0000 a2 : ffffffd010ada000 a3 : ffffffe00027ccf0 a4 : 0000000000040000 a5 : 0000000000040000 a6 : 0000000000f00000 a7 : ffffffe00027d6ba s2 : ffffffe00aacfc00 s3 : 0000000000000001 s4 : ffffffe00d98bc00 s5 : ffffffe0050495a8 s6 : ffffffe00aacfc00 s7 : ffffffe00423cdc8 s8 : 0000000000000000 s9 : ffffffe00458c0d0 s10: 0000000000000000 s11: 0000000000000000 t3 : 2699545dc3e5be00 t4 : ffffffc401031f97 t5 : ffffffc401031f99 t6 : ffffffe00f58c1f4 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 Call Trace: [<ffffffe00027ccf0>] task_ctx_sched_out+0x5c/0x60 kernel/events/core.c:2668 [<ffffffe00027cdca>] ctx_resched+0xd6/0x1ba kernel/events/core.c:2719 [<ffffffe00027d80e>] __perf_install_in_context+0x214/0x47c kernel/events/core.c:2801 [<ffffffe00026bcbc>] remote_function kernel/events/core.c:91 [inline] [<ffffffe00026bcbc>] remote_function+0xa8/0xc0 kernel/events/core.c:71 [<ffffffe0001452b2>] generic_exec_single+0x1a6/0x212 kernel/smp.c:293 [<ffffffe000145452>] smp_call_function_single+0x134/0x2ba kernel/smp.c:513 [<ffffffe00026af46>] task_function_call+0x90/0xee kernel/events/core.c:119 [<ffffffe00027c5da>] perf_install_in_context+0x174/0x2e6 kernel/events/core.c:2902 [<ffffffe000288d1c>] __do_sys_perf_event_open+0x10ea/0x199e kernel/events/core.c:12169 [<ffffffe00028fa72>] sys_perf_event_open+0x34/0x46 kernel/events/core.c:11775 [<ffffffe000005578>] ret_from_syscall+0x0/0x2 irq event stamp: 1944 hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_memcg_lruvec_state include/linux/memcontrol.h:979 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] mod_objcg_state mm/slab.h:296 [inline] hardirqs last enabled at (1943): [<ffffffe0003b3950>] memcg_slab_post_alloc_hook+0x2ea/0x46a mm/slab.h:327 hardirqs last disabled at (1944): [<ffffffe0001452ae>] generic_exec_single+0x1a2/0x212 kernel/smp.c:292 softirqs last enabled at (1900): [<ffffffe0020f5fd2>] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (1900): [<ffffffe0020f5fd2>] release_sock+0xf6/0x122 net/core/sock.c:3085 softirqs last disabled at (1898): [<ffffffe0020f5f06>] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (1898): [<ffffffe0020f5f06>] release_sock+0x2a/0x122 net/core/sock.c:3072 ---[ end trace 757ee55d22552400 ]--- --- 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